Cite

Brown, George. Letter to Gray Brothers

MLA

Kilpatrick, Jack Frederick (1915-1967). Brown, George. Letter to Gray Brothers. Box 7, folder 579. 1931 May 1. https://collections.library.yale.edu/catalog/15492879.

APA, 6th edition

Kilpatrick, Jack Frederick (1915-1967). (["Box 7, folder 579"])(1931 May 1)[Brown, George. Letter to Gray Brothers]. https://collections.library.yale.edu/catalog/15492879.