Gumplowicz, L., & Horowitz, I. L. (1963). Outlines of sociology ([2nd English language ed.].). Paine-Whitman.
芝加哥风格引文Gumplowicz, Ludwig, 与 Irving Louis Horowitz. Outlines of Sociology. [2nd English language ed.]. New York: Paine-Whitman, 1963.
MLA引文Gumplowicz, Ludwig, 与 Irving Louis Horowitz. Outlines of Sociology. [2nd English language ed.]. Paine-Whitman, 1963.
警告：这些引文格式不一定是100％准确.