Kothari, C. R. (1997). Research methodology: Methods and techniques (Ed.2.).
Chicago Style aipamenaKothari, C R. Research Methodology: Methods and Techniques. Ed.2. New Delhi, Wiswa Prakashan, 1997.
MLA aipamenaKothari, C R. Research Methodology: Methods and Techniques. Ed.2. 1997.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.