An appendix is an additional part of an article or book, similar to a book or table. In general, you should cite it in the list of bibliographic references including the full source (be it a book or an article). When using a text citation, you will usually direct the reader directly to the appendix. The format will vary depending on the style you use, be it MLA (Modern Language Association), APA (American Psychological Association), or Chicago style.
Steps
Method 1 of 3: MLA Style

Step 1. Start entering the bibliographic references including the author's last name
As with any other book, write the author's last name first, followed by a comma and then his first name and second initial (if available). End this section of the quote by placing a period.
Example: Lane, Luisa

Step 2. Write the title of the book in italics
After the period that follows the author's name, copy the title of the book in uppercase and lowercase. In the MLA style, all nouns, pronouns, adjectives, verbs, and adverbs are generally capitalized. After the title, put a period at the end.
Example: Lane, Luisa. Saved Repeatedly by Superman: My Work with Clark Kent

Step 3. Identify the publisher and year of publication
Generally, the entry for bibliographic references ends with information about the book's publication. After including the publisher's name, put a comma and then the year of publication. End the appointment with a period.
Example: Lane, Luisa. Saved Repeatedly by Superman: My Work with Clark Kent. DC Press, 2017

Step 4. Write the page numbers only if you refer to the appendix
If the appendix of the book is the only thing you are going to use, finish the entry of the bibliographic references with the page numbers in which the appendix appears. This is very similar to how you would cite a specific chapter or essay in an edited book. Put a comma in place of a period after the year of publication. Before placing page numbers, use the abbreviation "p." in the case of a single page, or "pp." In the event that there are several.
Example: Lane, Luisa. Saved repeatedly by Superman: My work with Clark Kent. DC Press, 2017, pp. 512-514

Step 5. Treat the appendix as a separate work in case it has a separate author
Rarely will an author write an appendix to a book or collection that someone else has written or edited. In this case, you write the entry to the bibliographic references as if you were the author of a part of the larger work.
Example: Lane, Luisa. "Appendix: fellow superheroes". Heroes Through the Ages, edited by Stan Lee, DC Press, 2017, pp. 512-514

Step 6. Use the word “appendix” in the quotation in parentheses
Generally, you should include the author's last name and page number in the parenthetical citation in the body of the document. If you're citing an appendix, you don't need to include the page number.
- Example: (Lane, appendix)
- Some books have multiple appendices. In that case, specify which appendix you refer to with the same label used in the book (usually a capital letter). For example: (Lane, Appendix A).

Step 7. Mention in the text that you refer to the appendix
In the body of the document, you can tell readers that the material you are referring to is in the appendix of the main paper, rather than in the body of it.
Example: In the appendix to her book, Luisa Lane lists the traits of an ideal superhero companion
Method 2 of 3: APA Style

Step 1. Begin by writing the author's last name and initials
If the work is a book, the complete citation in the bibliographic references must include the author's last name followed by a comma. Enter the initials of the first and middle names, if available. End this section of the quote by placing a period (usually a period is placed after an initial).
Example: Lane, L

Step 2. Include the year of publication in parentheses
After typing in the author's name, include the book's publication year as it appears on the title page or copyright information. If the book has multiple editions, include the publication year of the book you read. Finally, put a period after the closing of the parentheses.
Example: Lane, L. (2017)

Step 3. Write the full title of the book in italics
After entering the year of publication, write the title by capitalizing the first word and any proper nouns. If the book has a subtitle, put a colon after the title and then write it. Capitalize the first word and any noun in the subtitle. Finally, put a period.
Example: Lane, L. (2017). Saved Repeatedly by Superman: My Work with Clark Kent

Step 4. Finalize the appointment including the publication information
If it is a printed book, write the location of the publisher followed by a colon. Then write the name of the publisher that published the book. Finally, put a period at the end of the quote.
- Example: Lane, L. (2017). Saved Repeatedly by Superman: My Work with Clark Kent New York, NY: DC Publications.
- If it is a book published in the United States, include the name of the city and the postal abbreviation of the state. For any other country, write the name of the city and the name of that country.

Step 5. Write the quote in text following the author-date format
The text citation in parentheses for the appendix of a larger work does not differ much from a normal citation. However, after the year of publication, add the word “appendix” to direct readers directly to the appendix.
- Example: (Lane, 2017, appendix)
- If the work has multiple appendices, use the included tag to point readers to the correct appendix. For example: (Lane, 2017, appendix A)
Method 3 of 3: Chicago Style

Step 1. Write the author's last name first followed by his first name
In references, the full citation always begins with the author's name. If the author of the appendix is different from the rest of the work, use the name of the first.
Example: Lane, Luisa

Step 2. Identify the part of the work that you are going to cite
Typically, the next part of the quote would be the job title. However, since you are only citing the appendix, use the phrase “appendix of” to introduce the title of the book. Finally, write the title in italics, capitalizing the first word and all proper nouns.
- Example: Lane, Luisa. Saved repeatedly by Superman appendix: My work with Clark Kent.
- If the author of the rest of the work is a different one, include his name after the title. For example: Lane, Luisa. Appendix of Heroes through the Ages, edited by Stan Lee.

Step 3. Add page numbers to the end of the quote
Unlike when you cite the entire work, if you only cite part of the work (eg, an appendix), include the appendix page numbers in the full citation at the end of the title. Use the abbreviation "pp" for multiple pages, or "p" for just one. Lastly, put a period after the final page number.
- Example of a work with only one author: Lane, Luisa. Saved repeatedly by Superman appendix: My work with Clark Kent, pp. 512-514.
- Example of a work with different authors: Lane, Luisa. Heroes Through the Ages Appendix, by Stan Lee, pp. 711-713.

Step 4. Finalize the appointment including the publication information
To complete the citation, include the location of the publisher, the publisher's name, and the year of publication. Put a colon after the location and then write the full name of the publisher. Put a comma after the name and then write the year the book was published.
Example: Lane, Luisa. Saved repeatedly by Superman appendix: My work with Clark Kent, pp. 512-514. New York, NY: DC Publications, 2017

Step 5. Begin by writing the author's name in the footnotes
A footnote in the body of the document must have the same format as the bibliographic citation. However, write the author's first and last name followed by a comma instead of a period between the parts of the quote. Publication information must be enclosed in parentheses. Note that the page numbers come at the end of the footnote rather than immediately after the title.