MLA

Beinecke, Edwin J. (Edwin John), 1886-1970. Songs of Travel and Other Verses (6894-6898). Box 43, folder 943-945. undated. https://collections.library.yale.edu/catalog/11186577.

APA, 6th edition

Beinecke, Edwin J. (Edwin John), 1886-1970. (["Box 43, folder 943-945"])(undated)[Songs of Travel and Other Verses (6894-6898)]. https://collections.library.yale.edu/catalog/11186577.