Babbie, Earl R.
The practice of social research
Thomson/Wadsworth, 2004
 Buku Teks SO
Babbie, Earl R.
The practice of social research
Wodsworth, 1986
 Buku Teks SO
Babbie, Earl R.
The practice of social research
Wadsworth and Cengage Learning, 2013
 Buku Teks SO
Babbie, Earl R.
The practice of social research
Wadsworth, 2010
 Buku Teks SO
Babbie, Earl R.
The Practice of social research
Wadsworth, 1991
 Buku Teks SO