Paust, Jordan J., author
St. Paul Minn, 2000
Buku Teks
Lowenfeld, Andreas F., author
Buku Teks
Gary Joseph, Georgina Carson, Phyllis Brodkin, William Abbott, Geuffrey Wells
Carswell, 2011
Buku Referensi
Collins, Lawrence, author
Clarendon Press, 1994
Buku Teks
Dessem, R. Lawrence, author
Thomson/West, 2011
Buku Teks