MLA

Simpson, Randolph Linsly, 1927-1992. Keystone View Company, Meadville, PA; and other cities. Copyright B.L. Singley "278. Harvesting Cocoanuts, Lake Worth, Fla., U.S.A." Stereograph, grey card. Box 13, folder 622. 1893. https://collections.library.yale.edu/catalog/32582574.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 13, folder 622"])(1893)[Keystone View Company, Meadville, PA; and other cities. Copyright B.L. Singley "278. Harvesting Cocoanuts, Lake Worth, Fla., U.S.A." Stereograph, grey card]. https://collections.library.yale.edu/catalog/32582574.