MLA

Plowden, David (1932). Farmland Looking West from County Highway X-47. One Mile North of Petersburg, Delaware County, Iowa (700-33). Box 145. 2000 July. https://collections.library.yale.edu/catalog/2043074.

APA, 6th edition

Plowden, David (1932). (["Box 145"])(2000 July)[Farmland Looking West from County Highway X-47. One Mile North of Petersburg, Delaware County, Iowa (700-33)]. https://collections.library.yale.edu/catalog/2043074.