Schutt, Russell K., author
Sage, 2006
Buku Teks
Russell, Schutt, 1951-, author
Sage, 2012
Buku Teks
Babbie, Earl, author
Wadsworth, 2010
Buku Teks
Babbie, Earl, author
Thomson/Wadsworth, 2004
Buku Teks
Babbie, Earl, author
Wadsworth and Cengage Learning, 2013
Buku Teks