Koul, L. (1984). Methodology of educational research. Vikas.
Lua i Stíl Chicago (17ú heag.)Koul, Lokesh. Methodology of Educational Research. New Delhi: Vikas, 1984.
Lua MLA (8ú heag.)Koul, Lokesh. Methodology of Educational Research. Vikas, 1984.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.