Matt, Stephen R., author
Goodheart-Willcox, 1994
Buku Teks
Patrick, Dale R., author
Prenticel Hall Carreer & Technology, 1990
Buku Teks
Miller, Gary M., author
Prentice-Hall, 1981
Buku Teks
Hughes, Edward, author
John Wiley & Sons, 1987
Buku Teks
Hughes, Edward, author
Longman, 1991
Buku Teks