MLA

Leonard, Jesse H. (Jesse Hoyt). 1862-1956. Jesse H. Leonard papers, 1860-1900. Box 2. https://collections.library.yale.edu/catalog/2001140.

APA, 6th edition

Leonard, Jesse H. (Jesse Hoyt). 1862-1956. (["Box 2"])[Jesse H. Leonard papers, 1860-1900]. https://collections.library.yale.edu/catalog/2001140.