Cite

Petrolia, Butler County, Pennsylvania.

MLA

Sanborn Map Company, cartographer. Petrolia, Butler County, Pennsylvania. Sanborn Map Company, 0AD. https://collections.library.yale.edu/catalog/16372757.

APA, 6th edition

Sanborn Map Company, cartographer. (0 C.E.). Petrolia, Butler County, Pennsylvania. [Cadastral maps., Fire insurance maps.]. Sanborn Map Company, https://collections.library.yale.edu/catalog/16372757.