MLA

Beinecke, Edwin J. (Edwin John), 1886-1970. Masson, Rosaline [Orme]. Box 75, folder 1862. 1924 August 6. https://collections.library.yale.edu/catalog/16609959.

APA, 6th edition

Beinecke, Edwin J. (Edwin John), 1886-1970. (["Box 75, folder 1862"])(1924 August 6)[Masson, Rosaline [Orme]]. https://collections.library.yale.edu/catalog/16609959.