The officer of Education Research and Development Ministry of National Education,
Majalah, Jurnal, Buletin
Artikel Jurnal
Tang, John
Asian Institue of Technology, 1989
Buku Referensi
Jannete H. Malata Silva
Directorate of research and community engagement Universitas Indonesia, 2017
Artikel Jurnal
Best, John W.
Pearson, 2014
Buku Teks