MLA

Wheeler, Monroe, 1899-1988. Nabokov, Nicolas. Box 204, folder 2402. 1956. https://collections.library.yale.edu/catalog/17064462.

APA, 6th edition

Wheeler, Monroe, 1899-1988. (["Box 204, folder 2402"])(1956)[Nabokov, Nicolas]. https://collections.library.yale.edu/catalog/17064462.