MLA

Bryher, 1894-1983. Sachs, Hanns. Box 115, folder 4045-4046. 1929-37, n.d.. https://collections.library.yale.edu/catalog/2057153.

APA, 6th edition

Bryher, 1894-1983. (["Box 115, folder 4045-4046"])(1929-37, n.d.)[Sachs, Hanns]. https://collections.library.yale.edu/catalog/2057153.