MLA

Plowden, David (1932). Gallitzin, Pennsylvania (875-232). Box 5. 1975 August. https://collections.library.yale.edu/catalog/2036730.

APA, 6th edition

Plowden, David (1932). (["Box 5"])(1975 August)[Gallitzin, Pennsylvania (875-232)]. https://collections.library.yale.edu/catalog/2036730.