Fort Snelling, at junction of the Mississippi and Minnesota.
MLA
Gallery, Whitney's. Fort Snelling, at Junction of the Mississippi and Minnesota. Whitney's Gallery, 0AD. https://collections.library.yale.edu/catalog/2014262.
APA, 6th edition
Gallery, W. (0 C.E.). Fort Snelling, at junction of the Mississippi and Minnesota. [Cartes-de-visite, Photograph albums, Photographic prints, Photographs]. Whitney's Gallery. https://collections.library.yale.edu/catalog/2014262.