Kothari, C. R. (2020). Research Methodology: Methods and Techniques (4th.). New Age International Publishers.
Chicago-viite (17. p.)Kothari, C R. Research Methodology: Methods and Techniques. 4th. Banglore: New Age International Publishers, 2020.
MLA-viite (9. p.)Kothari, C R. Research Methodology: Methods and Techniques. 4th. New Age International Publishers, 2020.
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