MLA

Pratt, Richard Henry, 1840-1924. Clippings. Box 25, folder 789. 1877-99. https://collections.library.yale.edu/catalog/17104196.

APA, 6th edition

Pratt, Richard Henry, 1840-1924. (["Box 25, folder 789"])(1877-99)[Clippings]. https://collections.library.yale.edu/catalog/17104196.