Marshall Alfred. (1920). Principles of economics: An introductory volume (8th ed.). Macmillan.
芝加哥风格引文Marshall Alfred. Principles of Economics: An Introductory Volume. 8th ed. London: Macmillan, 1920.
MLA引文Marshall Alfred. Principles of Economics: An Introductory Volume. 8th ed. Macmillan, 1920.
警告：这些引文格式不一定是100％准确.