MLA

Heller, Alfred E., and collector. Photographs of the Golden Gate International Exposition. 1938. https://collections.library.yale.edu/catalog/2029248.

APA, 6th edition

Heller, A. E., & collector. (1938). Photographs of the Golden Gate International Exposition [Pictorial works, Photographic prints, World's fairs California San Francisco 1939]. https://collections.library.yale.edu/catalog/2029248.