MLA

Bryher, 1894-1983. Schaffner, Timothy. Box 56, folder 2077-2078. 1967-73, n.d.. https://collections.library.yale.edu/catalog/17466073.

APA, 6th edition

Bryher, 1894-1983. (["Box 56, folder 2077-2078"])(1967-73, n.d.)[Schaffner, Timothy]. https://collections.library.yale.edu/catalog/17466073.