Cite

G.W. Pach, New York, NY Group of four men in formal dress standing and seated on steps of entryway to stone building. Cabinet photograph.

MLA

Simpson, Randolph Linsly, 1927-1992. G.W. Pach, New York, NY Group of four men in formal dress standing and seated on steps of entryway to stone building. Cabinet photograph.. Box 9, folder 168. 1879. https://collections.library.yale.edu/catalog/2002220.

APA, 6th edition

Simpson, Randolph Linsly, 1927-1992. (["Box 9, folder 168"])(1879)[G.W. Pach, New York, NY Group of four men in formal dress standing and seated on steps of entryway to stone building. Cabinet photograph.]. https://collections.library.yale.edu/catalog/2002220.