1 | | Electronic Communication Systems / Louis E Frenzel . - Fifth edition. - New York, NY : McGraw-Hill, 2023. - viii, 164 pages ; 28 cm Số Đăng ký cá biệt: 00019705 |
2 | | Principles of electronic communication systems / Louis E. Frenzel Jr . - Fifth edition. - New York, NY : McGraw-Hill, 2023. - xv, 925 pages : Illustration ; 28 cm Số Đăng ký cá biệt: 00019723 |