Achmad Tardiyana, author
Gramedia Pustaka Utama , 2005
Buku Teks SO
EMAP Publishing,
Majalah, Jurnal, Buletin
Majalah, Jurnal, Buletin
Gordon, Douglas E., author
Van Nostrand Reinhold, 1991
Buku Teks
Philips, Alan, author
Chancellor Press, 1993
Buku Referensi