Ingle,Vinay K, author
Cengage Learning , 2012
Buku Teks
Burrus, C. Sidney, author
Paramount Communication Company, 1994
Buku Teks
Oppenheim, Alan V., author
Prentice Hall of India, 1997
Buku Teks
edited by Alan V. Oppenheim
Prentice-Hall, 1978
Buku Teks
Stanley, William D., author
Reston Publishing, 1984
Buku Teks