MLA

Wescott, Glenway, 1901-1987. McCullers, Carson. Box 73, folder 1071. 1957. https://collections.library.yale.edu/catalog/17065014.

APA, 6th edition

Wescott, Glenway, 1901-1987. (["Box 73, folder 1071"])(1957)[McCullers, Carson]. https://collections.library.yale.edu/catalog/17065014.