by Iwan Kurniawan $6.00
by Ir. M. Iqbal Hasan $12.00
by Dr. Moh. Efendi, M.Pd., M.Kes $7.00
by Prof. Dr. S. Nasution, M.A. $7.00
by James Lull $23.00
by Mahmud Thoha, APU $8.00