Gopal, M. (1970). An Int to Research Procedure in Social sciences (2nd.). Asia Pub House.
Cita Chicago (17th ed.)Gopal, M. An Int to Research Procedure in Social Sciences. 2nd. NULL: Asia Pub House, 1970.
Cita MLA (9th ed.)Gopal, M. An Int to Research Procedure in Social Sciences. 2nd. Asia Pub House, 1970.
Atenció: Aquestes cites poden no estar 100% correctes.