Hauer, Christian E.
Prentice-Hall, 1998
Buku Teks
Kingsland, William, author
George Allen and Unwin, 1954
Buku Teks
Cook, Stanley
Penguin Book, 1945
Buku Teks
Vaganay, Leon, author
Cambridge University Press, 1991
Buku Teks
Jenney, Ray Freeman
Harper and Brothers , 1955
Buku Teks