MLA

Foote, Mary, 1872-1968. Emmet, Leslie. Box 29. 1896-1901. https://collections.library.yale.edu/catalog/17271835.

APA, 6th edition

Foote, Mary, 1872-1968. (["Box 29"])(1896-1901)[Emmet, Leslie]. https://collections.library.yale.edu/catalog/17271835.