Pakistan: The Institut of Business Administration, 2007,
Majalah, Jurnal, Buletin
Johnny Chi-chen Chiang,
Majalah, Jurnal, Buletin
Turkish Review, 2010
Majalah, Jurnal, Buletin
Universitas Indonesia,
Majalah, Jurnal, Buletin
Louisiana : Louisiana State University
Majalah, Jurnal, Buletin