Research methods in social relations
by Claire Selltiz [and others]
Holt, Rinehart and Winston, 1959
 Buku Teks
Judd, Charles M.
Research methods in social relations
Methuen, 1991
 Buku Teks
McNeill, Patrick
Research methods
Routledge, 1990
 Buku Teks
White, Theresa L.
Research methods
Wadsworth and Cengage Learning, 2013
 Buku Teks
McNeill, Patrick
Research methods
Routledge, 1999
 Buku Teks