Kumar, R. (2019). Research methodology: A step-by-step guide for beginners (5th.). Sage.
芝加哥风格引文Kumar, Ranjit. Research Methodology: A Step-by-step Guide for Beginners. 5th. Los Angeles: Sage, 2019.
MLA引文Kumar, Ranjit. Research Methodology: A Step-by-step Guide for Beginners. 5th. Sage, 2019.
警告：这些引文格式不一定是100％准确.