APA (7th ed.) Citation

Ridge, M., & Billington, R. A. (1969). America's frontier story: A documentary history of westward expansion. Holt.

Chicago Style (17th ed.) Citation

Ridge, Martin, and Ray Allen Billington. America's Frontier Story: A Documentary History of Westward Expansion. New York: Holt, 1969.

MLA (9th ed.) Citation

Ridge, Martin, and Ray Allen Billington. America's Frontier Story: A Documentary History of Westward Expansion. Holt, 1969.