MLA

Plowden, David (1932). Northern Pacific Railway 4-6-6-4 Type Steam Locomotive Number 5122 Climbing Livingston Hill. Montana (NP-852-1). Box 73. 1952 August. https://collections.library.yale.edu/catalog/2041702.

APA, 6th edition

Plowden, David (1932). (["Box 73"])(1952 August)[Northern Pacific Railway 4-6-6-4 Type Steam Locomotive Number 5122 Climbing Livingston Hill. Montana (NP-852-1)]. https://collections.library.yale.edu/catalog/2041702.