Koul,, . L. (1997). Methodology of educational research (3rd rev ed.). Vikas.
Čikaški stil citiranjaKoul,, Lokesh. Methodology of Educational Research. 3rd rev ed. New Delhi: Vikas, 1997.
MLA način citiranjaKoul,, Lokesh. Methodology of Educational Research. 3rd rev ed. Vikas, 1997.
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