Kothari, C. R. (2014). Research methodology: Methods and techniques (3rd ed.). New Age.
Lua i Stíl Chicago (17ú heag.)Kothari, C. R. Research Methodology: Methods and Techniques. 3rd ed. New Delhi: New Age, 2014.
Lua MLA (8ú heag.)Kothari, C. R. Research Methodology: Methods and Techniques. 3rd ed. New Age, 2014.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.