MLA

Plowden, David (1932). Steamer Delta Queen, Heading Up-Stream on Mississippi River on "Illinois Side". Below Davenport, Iowa (964-983). Box 56. 1964 September. https://collections.library.yale.edu/catalog/2041333.

APA, 6th edition

Plowden, David (1932). (["Box 56"])(1964 September)[Steamer Delta Queen, Heading Up-Stream on Mississippi River on "Illinois Side". Below Davenport, Iowa (964-983)]. https://collections.library.yale.edu/catalog/2041333.