APA (7th ed.) Citation

Long, J. H., DenBoer, G., & Goodridge, G. E. (1993). Atlas of historical county boundaries. Simon & Schuster.

Chicago Style (17th ed.) Citation

Long, John Hamilton, Gordon DenBoer, and George E. Goodridge. Atlas of Historical County Boundaries. New York: Simon & Schuster, 1993.

MLA (9th ed.) Citation

Long, John Hamilton, et al. Atlas of Historical County Boundaries. Simon & Schuster, 1993.