Gopal, M. (1970). An intro. to research procedure in social sciences (2nd.). Asia Pub. House.
Chicago-čujuhus (17. p.)Gopal, M. An Intro. to Research Procedure in Social Sciences. 2nd. Bombay: Asia Pub. House, 1970.
MLA-čujuhus (9. p.)Gopal, M. An Intro. to Research Procedure in Social Sciences. 2nd. Asia Pub. House, 1970.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.