MLA

Simpson, Randolph Linsly, 1927-1992. Unknown photographer Exterior group portrait: survey crew of six: four white, two black. White man sits on instrument case in front, hat and notebook in hand studying maps, the rest stand in a line behind him with tripods, rods, various other tools of trade. Cased tintype, quarter plate. Box 5, folder 63. circa 1880. https://collections.library.yale.edu/catalog/2002120.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 5, folder 63"])(circa 1880)[Unknown photographer Exterior group portrait: survey crew of six: four white, two black. White man sits on instrument case in front, hat and notebook in hand studying maps, the rest stand in a line behind him with tripods, rods, various other tools of trade. Cased tintype, quarter plate]. https://collections.library.yale.edu/catalog/2002120.