MLA

Frederick Remington, 1861-1909, Kurtz. [3 pictures] [1] A United States trooper in winter uniform. [2] The medicine-man's signal: throwing dust in the air.--then the firing began. [3] A United States infantry soldier in winter uniform. 1891. https://collections.library.yale.edu/catalog/2016285.

APA, 6th edition

Frederick Remington, 1861-1909, & Kurtz. (1891)[[3 pictures] [1] A United States trooper in winter uniform. [2] The medicine-man's signal: throwing dust in the air.--then the firing began. [3] A United States infantry soldier in winter uniform]. https://collections.library.yale.edu/catalog/2016285.