MLA

Thayer, Scofield, 1889-1982. Hartley, Marsden. Box 34, folder 904. 1922, n.d.. https://collections.library.yale.edu/catalog/17142315.

APA, 6th edition

Thayer, Scofield, 1889-1982. (["Box 34, folder 904"])(1922, n.d.)[Hartley, Marsden]. https://collections.library.yale.edu/catalog/17142315.