Gaya APA

Hickman, M., Wigginton, E, O. (2009). Cooperative problem-solving activities for social studies, grades 6-12. 2nd Ed. (2). Thousand Oaks, California: Corwin Press.

Gaya MLA

Hickman, Michael., Wigginton, Erin, O'Donnell. "Cooperative problem-solving activities for social studies, grades 6-12. 2nd Ed.". 2 Thousand Oaks, California: Corwin Press, 2009. Text.