Kumar, R. (2014). Research Methodology (4th Ed.). Sage.
Chicago Style aipamenaKumar, Ranjit. Research Methodology. 4th Ed. Los angles: Sage, 2014.
MLA aipamenaKumar, Ranjit. Research Methodology. 4th Ed. Sage, 2014.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.