Your Own Appendix
Add your appendix immediately following your reference pages and label it as Appendix A, B, C, etc. Use these labels when discussing the appendix in the body of your paper. In the paper, after the sentence in which you are referencing your appendix, format the in-text citation as (See Appendix A). The letter should match the appropriate appendix label. Do not cite your own appendix on the reference page.
Another Author's Appendix
When using an appendix from another author, include this information on your reference page. For example, a citation on the reference page for an appendix found in a book should read: Author. (year). Appendix A of Title of work. Location: Publisher. The appendix letter should match the appropriate section you are using.