Kumar, R. (2011). Research Methodology (3rd ed.). Sage.
Chicago Style aipamenaKumar, Ranjit. Research Methodology. 3rd ed. New Delhi: Sage, 2011.
MLA aipamenaKumar, Ranjit. Research Methodology. 3rd ed. Sage, 2011.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.