Babbie, Earl, author
Cengage Learning, 2016
Buku Teks
Babbie, Earl, author
Wadsworth, 1991
Buku Teks
Babbie, Earl, author
Wadsworth, 1998
Buku Teks
May, Tim, author
Open University Press, 2001
Buku Teks
Crotty, Michael, author
Allend & Unwin, 1998
Buku Teks