MLA

Bryher, 1894-1983. Artwork: sketches. Box 151, folder 5108-5110. 1877, n.d.. https://collections.library.yale.edu/catalog/17290889.

APA, 6th edition

Bryher, 1894-1983. (["Box 151, folder 5108-5110"])(1877, n.d.)[Artwork: sketches]. https://collections.library.yale.edu/catalog/17290889.