Shenton, J. P., & Meckler, A. M. (1973). Programmed learning aid for United States history. Learning Systems.
芝加哥风格引文Shenton, James Patrick, 与 Alan M. Meckler. Programmed Learning Aid for United States History. Homewood, IL: Learning Systems, 1973.
MLA引文Shenton, James Patrick, 与 Alan M. Meckler. Programmed Learning Aid for United States History. Learning Systems, 1973.
警告：这些引文格式不一定是100％准确.