Sheftel, P. (1970). Exploring keyboard fundamentals. Holt, Rinehart.
芝加哥风格引文Sheftel, Paul. Exploring Keyboard Fundamentals. New York: Holt, Rinehart, 1970.
MLA引文Sheftel, Paul. Exploring Keyboard Fundamentals. Holt, Rinehart, 1970.
警告：这些引文格式不一定是100％准确.