MLA

Crawford Copper Mine ... Permanent Bunk House for Staff. Mexicans Slept Outdoors. Note Ore Dump of Cross-Cut Shaft. 1908. https://collections.library.yale.edu/catalog/2011218.

APA, 6th edition

Crawford Copper Mine ... permanent bunk house for staff. Mexicans slept outdoors. Note ore dump of cross-cut shaft. (1908). [Photographic prints, Photographs]. https://collections.library.yale.edu/catalog/2011218.