Schaefer, Richard T, author
McGraw-Hill, 1995
Buku Teks
Calhoun, Craig J., author
McGraw-Hill , 1994
Buku Teks
Giddens, Anthony, author
Cambridge Polity Press 1989,
Buku Teks
Nobbs, Jack
Macmillan Education, Ltd., 1989
Buku Teks
McGraw-Hill, 2003
Buku Teks