MLA

Lloyd, Lewis L. (1938). Correspondence related to Quartet Productions, Sap of Life (including invoices, investor files, actors contracts, and advertising). Box 2. 1961. https://collections.library.yale.edu/catalog/10516282.

APA, 6th edition

Lloyd, Lewis L. (1938). (["Box 2"])(1961)[Correspondence related to Quartet Productions, Sap of Life (including invoices, investor files, actors contracts, and advertising)]. https://collections.library.yale.edu/catalog/10516282.