by Prof. I. R. Poedjawijatna $6.00
by Ludovikus Ndona, SMM $5.00
by dr. Mary Rauff, dkk $7.00
by Faiza Hermain $7.00
by Ir. Adiwarman Karim, SE, MBA, MAEP $7.00
by Gustian Djuanda & Irwansyah Lubis $11.00
by Ir. Kaslan A. Tohir $9.00
by Edgar Morin $6.00
by Drs. P. Sumardji $6.00
by - $9.00
by Tb. Ace Hasan syadzily $12.00
by JALALUDDIN RAKHMAT $24.00