Graziano, A. M., & Raulin, M. L. (2010). Research methods: A process of inquiry (7th ed.). Allyn and Bacon.
Cita Chicago (17th ed.)Graziano, Anthony M., i Michael L. Raulin. Research Methods: A Process of Inquiry. 7th ed. Boston: Allyn and Bacon, 2010.
Cita MLA (9th ed.)Graziano, Anthony M., i Michael L. Raulin. Research Methods: A Process of Inquiry. 7th ed. Allyn and Bacon, 2010.
Atenció: Aquestes cites poden no estar 100% correctes.