APA (7th ed.) Citation

ProQuest Information and Learning Company & Sanborn Map Company. (2001). Digital Sanborn maps, 1867-1970. ProQuest Information and Learning Company.

Chicago Style (17th ed.) Citation

ProQuest Information and Learning Company and Sanborn Map Company. Digital Sanborn Maps, 1867-1970. [Ann Arbor, Mich.]: ProQuest Information and Learning Company, 2001.

MLA (9th ed.) Citation

ProQuest Information and Learning Company and Sanborn Map Company. Digital Sanborn Maps, 1867-1970. ProQuest Information and Learning Company, 2001.