Graziano, A. M., & Raulin, M. L. (2010). Research methods: A process of inquiry (7th ed.). Allyn and Bacon.
Lua i Stíl Chicago (17ú heag.)Graziano, Anthony M., agus Michael L. Raulin. Research Methods: A Process of Inquiry. 7th ed. Boston: Allyn and Bacon, 2010.
Lua MLA (9ú heag.)Graziano, Anthony M., agus Michael L. Raulin. Research Methods: A Process of Inquiry. 7th ed. Allyn and Bacon, 2010.
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