Shrader, Robert L.
Electronic communication / - 6th ed. - Lake forest: Macmillan, 1993. - xiii, 713 p.
0070571570
Telecommunication
621.38 / S5611
Electronic communication / - 6th ed. - Lake forest: Macmillan, 1993. - xiii, 713 p.
0070571570
Telecommunication
621.38 / S5611