Cite

Naco, Sonora. Fed. soldiers with soldadera in trench

MLA

Undritz, F. R. Naco, Sonora. Fed. Soldiers with Soldadera in Trench. 0AD. https://collections.library.yale.edu/catalog/2015418.

APA, 6th edition

Undritz, F. R. (0 C.E.). Naco, Sonora. Fed. soldiers with soldadera in trench [Photographic postcards, Photographic prints, Photographs]. https://collections.library.yale.edu/catalog/2015418.