Sorenson, Ritch
Business and management communication : a guide book
Prentice-Hall, 2001
Buku Referensi
The Computer users year book 1989 : supplier guide, volume 4
VNU Business Publications, 1989
Buku Referensi
The Computer users year book 1989 : services, volume 2
VNU Business Publications, 1989
Buku Referensi
Nasution, S.
Buku petunjuk membuat thesis, skripsi, book report, laporan
Jemmans, 1976
Buku Teks
The Computer users year book 1989 : installations, volume 3
VNU Business Publications, 1989
Buku Referensi