Leedy, P. D. (1980). Practical research: Planning and Desgn (2nd ed.). Macmillan.
芝加哥风格引文Leedy, Paul D. Practical Research: Planning and Desgn. 2nd ed. New York: Macmillan, 1980.
MLA引文Leedy, Paul D. Practical Research: Planning and Desgn. 2nd ed. Macmillan, 1980.
警告：这些引文格式不一定是100％准确.