MLA

Whitney, Eli, 1765-1825. 1812 April-June. Box 2, folder 42, reel 2 | reel 2U. 1812 April-June. https://collections.library.yale.edu/catalog/32521690.

APA, 6th edition

Whitney, Eli, 1765-1825. (["Box 2, folder 42, reel 2 | reel 2U"])(1812 April-June)[1812 April-June]. https://collections.library.yale.edu/catalog/32521690.