Sommer, B. B., & Sommer, R. (1997). A practical guide to behavioral research : tools and techniques / Barbara Sommer, Robert Sommer: Tools and techniques (4th ed.). Oxford University Press.
Chicago Style (17th ed.) CitationSommer, Barbara Baker, and Robert Sommer. A Practical Guide to Behavioral Research : Tools and Techniques / Barbara Sommer, Robert Sommer: Tools and Techniques. 4th ed. New York ; Oxford: Oxford University Press, 1997.
MLA (9th ed.) CitationSommer, Barbara Baker, and Robert Sommer. A Practical Guide to Behavioral Research : Tools and Techniques / Barbara Sommer, Robert Sommer: Tools and Techniques. 4th ed. Oxford University Press, 1997.
Warning: These citations may not always be 100% accurate.