Cram, D. (1961). Explaining "teaching machines" and programming. Fearon Pub.
芝加哥风格引文Cram, David. Explaining "Teaching Machines" and Programming. San Francisco: Fearon Pub, 1961.
MLA引文Cram, David. Explaining "Teaching Machines" and Programming. Fearon Pub, 1961.
警告：这些引文格式不一定是100％准确.