MLA

Counties Bordering on State Line between Illinois and Indiana / Wm. S. Peckham, Real Estate Agent, Lafayette Ind. Ehrogott, Gorgriger & Co., Lith., 1859. https://collections.library.yale.edu/catalog/15814390.

APA, 6th edition

Counties bordering on state line between Illinois and Indiana / Wm. S. Peckham, real estate agent, Lafayette Ind. (1859). [Maps]. Ehrogott, Gorgriger & Co., Lith., https://collections.library.yale.edu/catalog/15814390.