Babbie, Earl
The practice of social research
Wadsworth and Cengage Learning, 2013
 Buku Teks
Judd, Charles M.
Research methods in social relations
Methuen, 1991
 Buku Teks
Sjoberg, Gideon
A methodology for social research
Harper & Row Publishers, 1968
 Buku Teks
Lee, Raymond M.
Unobtrusive methods in social research
Open University Press, 2000
 Buku Teks
Babbie, Earl
Social research counts
Wadsworth and Cengage Learning, 2013 (International edition)
 Buku Teks