McBurney, D. H., & White, T. L. (2007). Research methods (7th ed.). Thomson Learning.
Cita Chicago (17th ed.)McBurney, Donald H., i Theresa L. White. Research Methods. 7th ed. Belmont, CA: Thomson Learning, 2007.
Cita MLA (8th ed.)McBurney, Donald H., i Theresa L. White. Research Methods. 7th ed. Thomson Learning, 2007.
Atenció: Aquestes cites poden no estar 100% correctes.