Styl cytowania APA

Kumar, R. (2014). Research methodology: A step by step guide for beginners (4th ed.). Sage.

Styl cytowania Chicago

Kumar, Ranjit. Research Methodology: A Step by Step Guide for Beginners. 4th ed. Los Angeles: Sage, 2014.

Styl cytowania MLA

Kumar, Ranjit. Research Methodology: A Step by Step Guide for Beginners. 4th ed. Sage, 2014.