MLA

Beinecke, Edwin J. (Edwin John), 1886-1970. "Copy Books". Box 36, folder 839-842. [1866-1872], undated. https://collections.library.yale.edu/catalog/16609873.

APA, 6th edition

Beinecke, Edwin J. (Edwin John), 1886-1970. (["Box 36, folder 839-842"])([1866-1872], undated)["Copy Books"]. https://collections.library.yale.edu/catalog/16609873.