Beins, B. C. (2019). Research Methods (4th.). Cambridge University Press.
Cita Chicago (17th ed.)Beins, Bernard C. Research Methods. 4th. Cambridge University Press, 2019.
Cita MLA (9th ed.)Beins, Bernard C. Research Methods. 4th. Cambridge University Press, 2019.
Atenció: Aquestes cites poden no estar 100% correctes.