MLA

Borland, Hal, 1900-1978. Eiseley, Loren and Mabel, correspondence. Box 37. 1964-1973. https://collections.library.yale.edu/catalog/17217892.

APA, 6th edition

Borland, Hal, 1900-1978. (["Box 37"])(1964-1973)[Eiseley, Loren and Mabel, correspondence]. https://collections.library.yale.edu/catalog/17217892.