Cite

Built by 22nd engineers in less than one hour

MLA

Built by 22nd Engineers in Less than One Hour. 0AD. https://collections.library.yale.edu/catalog/2017188.

APA, 6th edition

Built by 22nd engineers in less than one hour. (0 C.E.). [Photographic postcards, Photographic prints, Photographs]. https://collections.library.yale.edu/catalog/2017188.