MLA

Plowden, David (1932). New York Central Railroad, Two Trains Arriving at Harmon, New York. Harmon, New York (No number extant). Box 175. 1948 December. https://collections.library.yale.edu/catalog/10593380.

APA, 6th edition

Plowden, David (1932). (["Box 175"])(1948 December)[New York Central Railroad, Two Trains Arriving at Harmon, New York. Harmon, New York (No number extant)]. https://collections.library.yale.edu/catalog/10593380.