MLA

Photo, Newman. Photographic Postcards of The Stampede, Sheepshead Bay Speedway, Brooklyn, New York. Newman Photo, 1916. https://collections.library.yale.edu/catalog/2014401.

APA, 6th edition

Photo, N. (1916). Photographic postcards of The Stampede, Sheepshead Bay Speedway, Brooklyn, New York [Pictorial works, Photographic prints, Postcards]. Newman Photo. https://collections.library.yale.edu/catalog/2014401.