MLA

Longstreet, Stephen, 1907-2002. Doghouse. Box 4, folder 19. 1938. https://collections.library.yale.edu/catalog/32458564.

APA, 6th edition

Longstreet, Stephen, 1907-2002. (["Box 4, folder 19"])(1938)[Doghouse]. https://collections.library.yale.edu/catalog/32458564.