Motorcycle Rally, West Yellowstone, Mont.
MLA
Motorcycle Rally, West Yellowstone, Mont. 1976. https://collections.library.yale.edu/catalog/2016744.
APA, 6th edition
Motorcycle Rally, West Yellowstone, Mont. (1976). [Photographic postcards, Photographic prints, Photographs]. https://collections.library.yale.edu/catalog/2016744.