Kumar, R. (2011). Research Methodology: A step-by-step guide for beginners (3rd ed.). SAGE Publications India Pvt Ltd.
Cita Chicago (17th ed.)Kumar, Ranjit. Research Methodology: A Step-by-step Guide for Beginners. 3rd ed. NEW DELHI-110015: SAGE Publications India Pvt Ltd, 2011.
Cita MLA (9th ed.)Kumar, Ranjit. Research Methodology: A Step-by-step Guide for Beginners. 3rd ed. SAGE Publications India Pvt Ltd, 2011.
Atenció: Aquestes cites poden no estar 100% correctes.