Amling, F. (1977). Programmed learning aid for principles of investments ([Rev. ed.].). Learning Systems.
芝加哥风格引文Amling, Frederick. Programmed Learning Aid for Principles of Investments. [Rev. ed.]. Homewood, Ill.: Learning Systems, 1977.
MLA引文Amling, Frederick. Programmed Learning Aid for Principles of Investments. [Rev. ed.]. Learning Systems, 1977.
警告：这些引文格式不一定是100％准确.