MLA

Beinecke, Edwin J. (Edwin John), 1886-1970. Stoddard, Charles Warren. Box 60, folder 1306. 1903 June. https://collections.library.yale.edu/catalog/16609939.

APA, 6th edition

Beinecke, Edwin J. (Edwin John), 1886-1970. (["Box 60, folder 1306"])(1903 June)[Stoddard, Charles Warren]. https://collections.library.yale.edu/catalog/16609939.