MLA

Bryher, 1894-1983. Macpherson, Maud. Box 36, folder 1317-1319. 1944-63, n.d.. https://collections.library.yale.edu/catalog/2011755.

APA, 6th edition

Bryher, 1894-1983. (["Box 36, folder 1317-1319"])(1944-63, n.d.)[Macpherson, Maud]. https://collections.library.yale.edu/catalog/2011755.