Gopal, M. (1970). An Int to Research Procedure in Social sciences (2nd.). Asia Pub House.
Citazione stile Chigago Style (17a edizione)Gopal, M. An Int to Research Procedure in Social Sciences. 2nd. NULL: Asia Pub House, 1970.
Citatione MLA (9a ed.)Gopal, M. An Int to Research Procedure in Social Sciences. 2nd. Asia Pub House, 1970.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.