MLA

Newell, Peter, 1862-1924. Bradley, Florence Bradley, Horace. Box 6, folder 89. 1895-96. https://collections.library.yale.edu/catalog/17181128.

APA, 6th edition

Newell, Peter, 1862-1924. (["Box 6, folder 89"])(1895-96)[Bradley, Florence Bradley, Horace]. https://collections.library.yale.edu/catalog/17181128.