MLA

Beinecke, Edwin J. (Edwin John), 1886-1970. Information pertaining to The Wrecker. Box 74, folder 1770. undated. https://collections.library.yale.edu/catalog/15239283.

APA, 6th edition

Beinecke, Edwin J. (Edwin John), 1886-1970. (["Box 74, folder 1770"])(undated)[Information pertaining to The Wrecker]. https://collections.library.yale.edu/catalog/15239283.