MLA

Simpson, Randolph Linsly, 1927-1992. Unknown photographer Three quarter length portrait, soldier with bass drum, holding sticks. Cased tintype, gutta percha case, ninth plate. Box 5, folder 71. circa 1870. https://collections.library.yale.edu/catalog/2002128.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 5, folder 71"])(circa 1870)[Unknown photographer Three quarter length portrait, soldier with bass drum, holding sticks. Cased tintype, gutta percha case, ninth plate]. https://collections.library.yale.edu/catalog/2002128.