Collier, John Greenwood
Cambridge University Press, 1987
Buku Teks
Hay, Peter
West Publishing, 1994
Buku Teks
Ehrenzweig, Albert A.
West Publishing, 1959
Buku Teks
Collier, John Greenwood
Cambridge University Pers, 1994
Buku Teks
Mayss, Abla J.
Cavendish, 1994
Buku Teks