Brown, P. Charles, author
Oxford University Press, 1984
Buku Teks
Ouellette, Robert P., author
Petrocelli/Charter, 1975
Buku Teks
Wulf, William A., author
Addison-Wesley, 1981
Buku Teks
UNESCO, 1984
Buku Teks
Forsythe, Alexander I., author
John Wiley & Sons Inc. , 1970
Buku Teks