MLA

Plowden, David (1932). The Poughkeepsie Railroad Bridge, Hudson River. Between Poughkeepsie and Highland, New York (GFB-69-46). Box 131. 1969. https://collections.library.yale.edu/catalog/2042319.

APA, 6th edition

Plowden, David (1932). (["Box 131"])(1969)[The Poughkeepsie Railroad Bridge, Hudson River. Between Poughkeepsie and Highland, New York (GFB-69-46)]. https://collections.library.yale.edu/catalog/2042319.