Gopal, M. H. (1970). An introduction to research procedure in social sciences (2d rev. and enl. ed.). Asia Pub. House.
Čikaški stil citiranja (17. izdanje)Gopal, M. H. An Introduction to Research Procedure in Social Sciences. 2d rev. and enl. ed. New York: Asia Pub. House, 1970.
MLA način citiranja (9. izdanje)Gopal, M. H. An Introduction to Research Procedure in Social Sciences. 2d rev. and enl. ed. Asia Pub. House, 1970.
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