Bank, Marcus, author
Sage Publications, 2001
Buku Teks
Banks, Marcus, author
Sage, 2015
Buku Teks
Forcese, Dennis P., author
Prentice-Hall, 1973
Buku Teks
Judd, Charles M., author
Methuen, 1991
Buku Teks
Lee, Raymond M., author
Open University Press, 2000
Buku Teks