R, K. C. (2014). Research Methodology: Methods and Techniques (1st edition.). New Age.
Chicago Style (17th ed.) ZitazioaR, Kothari C. Research Methodology: Methods and Techniques. 1st edition. New Delhi: New Age, 2014.
MLA (9th ed.) ZitazioaR, Kothari C. Research Methodology: Methods and Techniques. 1st edition. New Age, 2014.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.