MLA

Beinecke, Edwin J. (Edwin John), 1886-1970. Robert Louis Stevenson Club. Box 75, folder 1848. 1921-1922. https://collections.library.yale.edu/catalog/16609956.

APA, 6th edition

Beinecke, Edwin J. (Edwin John), 1886-1970. (["Box 75, folder 1848"])(1921-1922)[Robert Louis Stevenson Club]. https://collections.library.yale.edu/catalog/16609956.