MLA

Wilder, Thornton, 1897-1975. Correspondence. Box 5, folder 102-107. 1930-34. https://collections.library.yale.edu/catalog/17071770.

APA, 6th edition

Wilder, Thornton, 1897-1975. (["Box 5, folder 102-107"])(1930-34)[Correspondence]. https://collections.library.yale.edu/catalog/17071770.