MLA

Steward, Samuel M., 1909-1993. Rechy, John - 6 typed letters signed, 1 card, 1960s including letters to Rudy Burckhardt. Box 3. 1960s. https://collections.library.yale.edu/catalog/17355680.

APA, 6th edition

Steward, Samuel M., 1909-1993. (["Box 3"])(1960s)[Rechy, John - 6 typed letters signed, 1 card, 1960s including letters to Rudy Burckhardt]. https://collections.library.yale.edu/catalog/17355680.