MLA

Thayer, Scofield, 1889-1982. "The Waste Land," typescript, corrected by J. Sibley Watson, Jr.. Box 20, folder 412. n.d.. https://collections.library.yale.edu/catalog/15497391.

APA, 6th edition

Thayer, Scofield, 1889-1982. (["Box 20, folder 412"])(n.d.)["The Waste Land," typescript, corrected by J. Sibley Watson, Jr.]. https://collections.library.yale.edu/catalog/15497391.