[Photograph of Rex Slinkard]
MLA
Fleckenstein, Louis, 1866-1943. [Photograph of Rex Slinkard]. Box 26 | 1 of 7. circa 1885-1957, undated. https://collections.library.yale.edu/catalog/16397722.
APA, 6th edition
Fleckenstein, Louis, 1866-1943. (["Box 26 | 1 of 7"])(circa 1885-1957, undated)[[Photograph of Rex Slinkard]]. https://collections.library.yale.edu/catalog/16397722.