MLA

Plowden, David (1932). Howard Forris, Gateman/Wiper, Steamer Crispin Oglebay, Columbia Steamship. Probably in Milwaukee, Wisconsin (990-6). Box 66. 1990 September. https://collections.library.yale.edu/catalog/2041513.

APA, 6th edition

Plowden, David (1932). (["Box 66"])(1990 September)[Howard Forris, Gateman/Wiper, Steamer Crispin Oglebay, Columbia Steamship. Probably in Milwaukee, Wisconsin (990-6)]. https://collections.library.yale.edu/catalog/2041513.