TY  - BOOK
AU  - Stallings,William
TI  - ISDN: an introduction 
SN  - 002946028X (pbk.)
PY  - 1989///
CY  - New York, London
PB  - Macmillan, Collier Macmillan
KW  - Integrated services digital networks
N1  - Includes index; Includes bibliographical references
ER  -