MLA

Lees-Milne, James, 1908-1997. Macaulay, Rose. Box 10, folder 492. 1943-49, n.d.. https://collections.library.yale.edu/catalog/17300580.

APA, 6th edition

Lees-Milne, James, 1908-1997. (["Box 10, folder 492"])(1943-49, n.d.)[Macaulay, Rose]. https://collections.library.yale.edu/catalog/17300580.