Wickham, Randall Easton, author
Sage publications , 2002
Buku Teks
Friedrich, William N., author
Sage Publications, 2001
Buku Teks
Davis, Laura, author
Harper Perennial, 1991
Buku Teks
Cattanach, Ann
Jessica Kingsley , 1992
Buku Teks
Kolko, David J.
Sage, 2002
Buku Teks