Cita APA

Sommer, B., & Sommer, R. (1997). A practical guide to behavioral research: Tools and techniques (4a. ed.). New York: Oxford University.

Citación estilo Chicago

Sommer, Barbara, y R. Sommer. A Practical Guide to Behavioral Research: Tools and Techniques. 4a. ed. New York: Oxford University, 1997.

Cita MLA

Sommer, Barbara, y R. Sommer. A Practical Guide to Behavioral Research: Tools and Techniques. 4a. ed. New York: Oxford University, 1997.