Cite

A.F. Styles, Burlington, VT "Guides Mat, Nick., Entrance to Mammoth Cave, Ky.", Stereograph, yellow card

MLA

Simpson, Randolph Linsly, 1927-1992. A.F. Styles, Burlington, VT "Guides Mat, Nick., Entrance to Mammoth Cave, Ky.", Stereograph, yellow card. Box 13, folder 693. circa 1888. https://collections.library.yale.edu/catalog/32582727.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 13, folder 693"])(circa 1888)[A.F. Styles, Burlington, VT "Guides Mat, Nick., Entrance to Mammoth Cave, Ky.", Stereograph, yellow card]. https://collections.library.yale.edu/catalog/32582727.