Singh, K. (2007). Quantitative social research methods. Sage.
Cita Chicago (17th ed.)Singh, Kultar. Quantitative Social Research Methods. New Delhi: Sage, 2007.
Cita MLA (9th ed.)Singh, Kultar. Quantitative Social Research Methods. Sage, 2007.
Atenció: Aquestes cites poden no estar 100% correctes.