MLA

Collins, Seward, 1899-1952. Woolf, Virginia. Box 13, folder 356. 1930 Mar 11. https://collections.library.yale.edu/catalog/32471787.

APA, 6th edition

Collins, Seward, 1899-1952. (["Box 13, folder 356"])(1930 Mar 11)[Woolf, Virginia]. https://collections.library.yale.edu/catalog/32471787.