MLA

Simpson, Randolph Linsly, 1927-1992. A. Miller, no location Full length group portrait; 3 black cavalry soldiers, standing, armed: the one at center holds a Sharps carbine, the other two present drawn revolvers and wear cartridge belts. Cabinet photograph. Box 9, folder 285. circa 1880. https://collections.library.yale.edu/catalog/2002342.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 9, folder 285"])(circa 1880)[A. Miller, no location Full length group portrait; 3 black cavalry soldiers, standing, armed: the one at center holds a Sharps carbine, the other two present drawn revolvers and wear cartridge belts. Cabinet photograph]. https://collections.library.yale.edu/catalog/2002342.