MLA

Watkins, Carleton E., 1829-1916. View of Capt. Jack's stronghold in the Lava Bed, showing Modoc fortification in fore and back grounds. Mount Shasta in the distance, looking South-west. Watkins 1. [1872-73]. https://collections.library.yale.edu/catalog/2056985.

APA, 6th edition

Watkins, Carleton E., 1829-1916. (["Watkins 1"])([1872-73])[View of Capt. Jack's stronghold in the Lava Bed, showing Modoc fortification in fore and back grounds. Mount Shasta in the distance, looking South-west]. https://collections.library.yale.edu/catalog/2056985.