U.S.A : Bowling Green U.S.A. Philosophy Documentation Center
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
Frank Cass & Co. Ltd.,
Majalah, Jurnal, Buletin
The University of Chicago Press,
Majalah, Jurnal, Buletin