Robinson, Jeremy
New York: McGraw-Hill, 1979
Buku Teks
EMAP, Royal Mail International c/o Smartmail, {s.a}
Majalah, Jurnal, Buletin
Donhead,
Majalah, Jurnal, Buletin
TASCHE, 2010
Buku Referensi
Yandi Andri Yatmo
Fakultas Teknik Universitas Indonesia, 2007
UI - Laporan Penelitian