Sapien, M. (1997). Mastering ISDN (Integrated Services Digital Network). BPB.
Dyfyniad Arddull ChicagoSapien, Mike. Mastering ISDN (Integrated Services Digital Network). New Delhi: BPB, 1997.
Dyfyniad MLASapien, Mike. Mastering ISDN (Integrated Services Digital Network). BPB, 1997.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.