McGettrick, Andrew D., author
Cambridge Univeristy Press, 1982
Buku Teks
Wood, Steve, author
McGraw-Hill, 1988
Buku Teks
Johnson, Philip I., author
McGraw-Hill, 1985
Buku Teks
Addison-Wesley, 1990
Buku Teks
Keller, Arthur M., author
McGraw-Hill, 1982
Buku Teks