TY  - GEN
AU  - Heldman, Robert K.
TI  - Information telecommunications: networks, products, and services
SN  - 0070280401
PY  - 1994///
CY  - New York: 
PB  - McGraw-Hill
KW  - Telecommunication
KW  - Social aspects
KW  - Information networks
KW  - Information science
ER  -