Kirk, Cheryl
The internet phone connection / Cheryl Kirk
McGraw-Hill, 1997
 Buku Referensi
Walkup, Renee P.
Selling to anyone over the phone
American Management Association, 2006
 eBooks
Walkup, Renee P.
Selling to anyone over the phone
[American Management Association;, ], 2011
 eBooks
Abraham, Ralph
The WEB empowerment book : an introduction and connection guide to internet and the World-Wide Web
Telos , 1995
 Buku Teks
Shelly, Gary B.
Discovering the internet: complete
Course Technology Cengage Learning, 2012
 Buku Teks