APA (7th ed.) Citation

Sommer, B. B., & Sommer, R. (1991). A practical guide to behavioral research: Tools and techniques (3. ed.). Oxford Univ. Press.

Chicago Style (17th ed.) Citation

Sommer, Barbara B., and Robert Sommer. A Practical Guide to Behavioral Research: Tools and Techniques. 3. ed. New York u.a: Oxford Univ. Press, 1991.

MLA (9th ed.) Citation

Sommer, Barbara B., and Robert Sommer. A Practical Guide to Behavioral Research: Tools and Techniques. 3. ed. Oxford Univ. Press, 1991.