Cite

Great Wall of China at Shanhaiguan, Hebei, China, ca. 1920-1937

MLA

Great Wall of China at Shanhaiguan, Hebei, China, Ca. 1920-1937. 1920. https://collections.library.yale.edu/catalog/11479041.

APA, 6th edition

Great Wall of China at Shanhaiguan, Hebei, China, ca. 1920-1937. (1920). [Photographs (AAT), topographical views (AAT)]. https://collections.library.yale.edu/catalog/11479041.