MLA

Wescott, Glenway, 1901-1987. Guérin, Jacques. Box 54, folder 776-780. 1928-87, n.d.. https://collections.library.yale.edu/catalog/17065009.

APA, 6th edition

Wescott, Glenway, 1901-1987. (["Box 54, folder 776-780"])(1928-87, n.d.)[Guérin, Jacques]. https://collections.library.yale.edu/catalog/17065009.