MLA

Plowden, David (1932). Ferryboat Louisiana Leaving Baton Rouge on Mississippi River. Baton Rouge, Louisiana (1064-421). Box 56. 1964 October. https://collections.library.yale.edu/catalog/2041334.

APA, 6th edition

Plowden, David (1932). (["Box 56"])(1964 October)[Ferryboat Louisiana Leaving Baton Rouge on Mississippi River. Baton Rouge, Louisiana (1064-421)]. https://collections.library.yale.edu/catalog/2041334.