Kumar, R. (2014). Research Methodology (4th.). Sage.
Lua i Stíl Chicago (17ú heag.)Kumar, Ranjit. Research Methodology. 4th. New Delhi: Sage, 2014.
Lua MLA (9ú heag.)Kumar, Ranjit. Research Methodology. 4th. Sage, 2014.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.