Billington, R. A., & Ridge, M. (2001). Westward expansion : a history of the American frontier / Ray Allen Billington, Martin Ridge: A history of the American frontier (6th ed., abridged.). University of New Mexico Press.
Chicago Style (17th ed.) CitationBillington, Ray Allen, and Martin Ridge. Westward Expansion : A History of the American Frontier / Ray Allen Billington, Martin Ridge: A History of the American Frontier. 6th ed., abridged. Albuquerque: University of New Mexico Press, 2001.
MLA (9th ed.) CitationBillington, Ray Allen, and Martin Ridge. Westward Expansion : A History of the American Frontier / Ray Allen Billington, Martin Ridge: A History of the American Frontier. 6th ed., abridged. University of New Mexico Press, 2001.
Warning: These citations may not always be 100% accurate.