MLA

Jolas, Eugène, 1894-1952. Solveen, Henri. Box 3, folder 70. 1950. https://collections.library.yale.edu/catalog/17337754.

APA, 6th edition

Jolas, Eugène, 1894-1952. (["Box 3, folder 70"])(1950)[Solveen, Henri]. https://collections.library.yale.edu/catalog/17337754.