R Horak; Communications
Systems & Networks; M&T Books, NY; 1996
- Bell Laboratories,Engineering and Operations in the Bell System;,
NJ 1977
- J Brooks; Telephone: The First Hundred Years; Harper & Row,
NY; 1976
- D Rohde; Those #$(&%*!% Area Codes; Network World, 18 Sept
1996
- T Green; Phone Numbers are Running Out; Network World; 20 May
1996
- M Rozansky; Ready or Not, Here Comes Two More Local Area Codes; Phila.
Inquirer, 4 Apr 1997
- M Garfinkle; US Patent 6,141,408; 2000
- V Toth;The FCC's Complex Plans for Number Portability; Bus. Communications
Review, Oct 1995