Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.