MLA

Plowden, David (1932). Former U. S. 66 Highway Bridge, Old Trails Bridge, Colorado River. Topock, Arizona (GFB-68-3921). Box 50. 1968. https://collections.library.yale.edu/catalog/2041123.

APA, 6th edition

Plowden, David (1932). (["Box 50"])(1968)[Former U. S. 66 Highway Bridge, Old Trails Bridge, Colorado River. Topock, Arizona (GFB-68-3921)]. https://collections.library.yale.edu/catalog/2041123.