Gaya APA

Sommer, B., Sommer, R. (1991). A Practical Guide to Behavioral Research: Tools and Techniques (3 rd Ed..). Upper Saddle River, NJ: Wiley.

Gaya MLA

Sommer, Barbara., Sommer, Robert. "A Practical Guide to Behavioral Research: Tools and Techniques". 3 rd Ed.. Upper Saddle River, NJ: Wiley, 1991. Text.