De La Saller University, 2005
Majalah, Jurnal, Buletin
Chicago : University of Chicago Press
Majalah, Jurnal, Buletin
edited by Hoarst Noack
University Park Press , 1980
Buku Teks
Colombo Plan Staff College for Technician education , 1986
Buku Teks
Ministry of Education, Science and Culture, 1985
Buku Referensi