Kumar,Ranjit. (2014). Research methodology: A step-by-step guide for beginners (4th.). Sage.
Chicago-viite (17. p.)Kumar,Ranjit. Research Methodology: A Step-by-step Guide for Beginners. 4th. New Delhi: Sage, 2014.
MLA-viite (9. p.)Kumar,Ranjit. Research Methodology: A Step-by-step Guide for Beginners. 4th. Sage, 2014.
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