Leedy Paul D. (2001). Practical Research Planning and Design. Merrill Prentice Hall.
芝加哥风格引文Leedy Paul D. Practical Research Planning and Design. MPH: Merrill Prentice Hall, 2001.
MLA引文Leedy Paul D. Practical Research Planning and Design. Merrill Prentice Hall, 2001.
警告：这些引文格式不一定是100％准确.