Loomis, Mary E.S.
Data communications
Prentice-Hall, 1983
 Buku Teks
Stallings, William
Data and communications
Prentice-Hall, 1994
 Buku Teks
Statistical pocket book of Indonesia 1963
Indonesia. Biro Pusat Statistik
Biro Pusat Statistik, 1963
 Buku Referensi
Brindley, Keith
Newnes electronics engineer's pocket book
A Butterworth-Heinemann Book, 1994
 Buku Teks
Heijer, P.C. den
Komunikasi data = data communications
Elex Media Komputindo, 1987
 Buku Teks