MLA

Purdy, James, 1914-2009. Maugham, Somerset. Box 3, folder 73. 1956, n.d.. https://collections.library.yale.edu/catalog/32210530.

APA, 6th edition

Purdy, James, 1914-2009. (["Box 3, folder 73"])(1956, n.d.)[Maugham, Somerset]. https://collections.library.yale.edu/catalog/32210530.