MLA

Lynes, George Platt, 1907-1955. Photographic postcard: Two male athletes: "Partnerubung: Waage" by Siegfried Dietrich (from: SII-49). Box 5, folder 86. ca. 1900-55. https://collections.library.yale.edu/catalog/17067744.

APA, 6th edition

Lynes, George Platt, 1907-1955. (["Box 5, folder 86"])(ca. 1900-55)[Photographic postcard: Two male athletes: "Partnerubung: Waage" by Siegfried Dietrich (from: SII-49)]. https://collections.library.yale.edu/catalog/17067744.