MLA

Bartlett, Henrietta C. (Henrietta Collins), 1873-1963. Grolier Club. Box 2, folder 90. 1921-39. https://collections.library.yale.edu/catalog/17341674.

APA, 6th edition

Bartlett, Henrietta C. (Henrietta Collins), 1873-1963. (["Box 2, folder 90"])(1921-39)[Grolier Club]. https://collections.library.yale.edu/catalog/17341674.