Billington, R. A. (1956). The Far Western frontier, 1830-1860 ([1st ed.].). Harper.
芝加哥风格引文Billington, Ray Allen. The Far Western Frontier, 1830-1860. [1st ed.]. New York: Harper, 1956.
MLA引文Billington, Ray Allen. The Far Western Frontier, 1830-1860. [1st ed.]. Harper, 1956.
警告：这些引文格式不一定是100％准确.