MLA

Emmons, George F. (George Foster), 1811-1884. Sketchbook 1. Box 1. 1838 1842. https://collections.library.yale.edu/catalog/10732816.

APA, 6th edition

Emmons, George F. (George Foster), 1811-1884. (["Box 1"])(1838 1842)[Sketchbook 1]. https://collections.library.yale.edu/catalog/10732816.