Singh, K. (2007). Quantitative social research methods. Sage Publications.
Cita Chicago (17th ed.)Singh, Kultar. Quantitative Social Research Methods. Los Angeles: Sage Publications, 2007.
Cita MLA (8th ed.)Singh, Kultar. Quantitative Social Research Methods. Sage Publications, 2007.
Atenció: Aquestes cites poden no estar 100% correctes.