Sommer, R. (1997). A practical guide to behavioral research: Tools and techniques (4th ed.). OUP.
芝加哥风格引文Sommer, Robert. A Practical Guide to Behavioral Research: Tools and Techniques. 4th ed. New York: OUP, 1997.
MLA引文Sommer, Robert. A Practical Guide to Behavioral Research: Tools and Techniques. 4th ed. OUP, 1997.
警告：这些引文格式不一定是100％准确.