Lua APA (7ú heag.)

Billington, R. A. (1962). The Far Western frontier, 1830-1860. Harper & Row.

Lua i Stíl Chicago (17ú heag.)

Billington, Ray Allen. The Far Western Frontier, 1830-1860. New York: Harper & Row, 1962.

Lua MLA (8ú heag.)

Billington, Ray Allen. The Far Western Frontier, 1830-1860. Harper & Row, 1962.

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