Marshall, John, author
Manager of Publications, 1936
Buku Teks
Jenkins, W.M., author
Wright , 1994
Buku Teks
Munter, Mary, author
Prentice-Hall, 2002
Buku Teks
Date, C.J., author
Addison-Wesley, 1988
Buku Teks
Morrison, Joline, author
Course Technology, 1998
Buku Teks