An appendix can be cited like any other division of a work: in the text.

A Single Appendix

You may refer to a single appendix in your prose or parenthetically.

In the appendix to her essay, Judith Bryant Wittenberg details several useful questions for classroom discussion of The Sound and The Fury.

Work Cited

Wittenberg, Judith Bryant. “Teaching The Sound and the Fury with Freud.” Approaches to Teaching Faulkner’s The Sound and the Fury, edited by Stephen Hahn and Arthur F. Kinney, Modern Language Association of America, 1996, pp. 73-78.

or

Judith Bryant Wittenberg details several useful questions for classroom discussion of The Sound and The Fury (appendix).

Work Cited

Wittenberg, Judith Bryant. “Teaching The Sound and the Fury with Freud.” Approaches to Teaching Faulkner’s The Sound and the Fury, edited by Stephen Hahn and Arthur F. Kinney, Modern Language Association of America, 1996, pp. 73-78.

Multiple Appendixes

Appendixes are generally labeled numerically or alphabetically, like tables and figures; sometimes, they are titled. If you cite an appendix from a work that includes more than one, include the label or title so that your reader can locate it:

Grady C. Wray catalogs Christ’s finezas, or love offerings, according to the Church Fathers, Antonio Viera, and Sor Juana (appendix A); he also details the scriptural references for Viera’s opinions (appendix B) and for Sor Juana’s (appendixes C, D).

Work Cited

Wray, Grady C. “Sacred Allusions: Theology in Sor Juana’s Work.” Approaches to Teaching the Works of Sor Juana Inés de la Cruz, edited by Emilie L. Bergmann and Stacey Schlau, Modern Language Association of America, 2007, pp. 65-76.

Appendix with Separate Author

Rarely, appendixes have an author different from that of the work. When the appendix appears in a unified, stand-alone work, you can treat it as a separate work:

Donaldson, Abby. “Appendix: Textual Emendations in the McDragon Monastery Manuscript Compared.” Studying Dragonology through Texts, edited by James T. O’Griffin and Kathy Fields, Augustine Press, 2007, pp. 342-44.

But for appendixes to sections of a work, as for an essay in an anthology, find a way to acknowledge the author in the text:

In her appendix to James M. Dean’s “The Hag Transformed,” Rachel Lapp compares plot elements in three medieval loathly lady tales (156-57).

 Work Cited

Dean, James M. “The Hag Transformed: ‘The Tale of Florent,’ Ethical Choice, and Female Desire in Late Medieval England.” Approaches to Teaching the Poetry of John Gower, edited by R. F. Yeager and Brian W. Gastle, Modern Language Association of America, 2011, pp. 143-58.