Cite

[Postcard : Photograph of Karl von Freyburg on horseback]

MLA

[Postcard : Photograph of Karl Von Freyburg on Horseback]. 0AD. https://collections.library.yale.edu/catalog/11194862.

APA, 6th edition

[Postcard : Photograph of Karl von Freyburg on horseback]. (0 C.E.). [Photographic postcards]. https://collections.library.yale.edu/catalog/11194862.