Cite

Two horses, Taos, New Mexico (4 x 5 inches)

MLA

Strand, Paul, 1890-1976. Two horses, Taos, New Mexico (4 x 5 inches). Box 1. 1930. https://collections.library.yale.edu/catalog/2003321.

APA, 6th edition

Strand, Paul, 1890-1976. (["Box 1"])(1930)[Two horses, Taos, New Mexico (4 x 5 inches)]. https://collections.library.yale.edu/catalog/2003321.