The officer of Education Research and Development Ministry of National Education,
Majalah, Jurnal, Buletin
De La Salle University Press, 2003
Majalah, Jurnal, Buletin
Center for International Higher Education Boston Collage,
Majalah, Jurnal, Buletin
Ministry of Education & Human Resources Development,
Majalah, Jurnal, Buletin
edited by Susan Higgins, Meta Brett
Longman, 1984
Buku Referensi