Beins, B. C. (2019). Research Methods (4th.). Cambridge University Press.
Cita Chicago (17th ed.)Beins, Bernard C. Research Methods. 4th. Cambridge: 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.