APA (7th ed.) Citation

Boyer, P. S., & Dubofsky, M. (2001). The Oxford companion to United States history. Oxford University Press.

Chicago Style (17th ed.) Citation

Boyer, Paul S., and Melvyn Dubofsky. The Oxford Companion to United States History. Oxford ; New York: Oxford University Press, 2001.

MLA (9th ed.) Citation

Boyer, Paul S., and Melvyn Dubofsky. The Oxford Companion to United States History. Oxford University Press, 2001.