MLA

Tchelitchew, Pavel, 1898-1957. Incoming. Box 1, folder 14. 1953. https://collections.library.yale.edu/catalog/17204707.

APA, 6th edition

Tchelitchew, Pavel, 1898-1957. (["Box 1, folder 14"])(1953)[Incoming]. https://collections.library.yale.edu/catalog/17204707.