Pusat Penelitian Sosial Ekonomi dan Kebijakan Kehutanan, Badan Penelitian dan Pengembangan Kehutanan - Departemen Kehutanan, 2003

 Majalah, Jurnal, Buletin

U.S.A : Bowling Green U.S.A. Philosophy Documentation Center

 Majalah, Jurnal, Buletin

Fuji Technology Press Ltd,

 Majalah, Jurnal, Buletin

The officer of Education Research and Development Ministry of National Education,

 Majalah, Jurnal, Buletin

Ministry of forestry forestry research and development agency ,

 Majalah, Jurnal, Buletin