Healey, Joseph F., 1945-
Wadsworth, 1996
Buku Teks
Healey, Joseph F., 1945-
Wadsworth and Cengage Learning, 2012
Buku Teks
Healey, Joseph F., 1945-
Cengage Learning, 2016
Buku Teks
Babbie, Earl
Wadsworth, 2010
Buku Teks
Dunn, Dana S.
Wiley-Blackwell, 2009
Buku Teks