by Arief, Sritua $6.00
by Dr. Bustanul Arifin $11.00
by Prof. DR. Taliziduhu Ndraha $7.00
by Hermawan Kartajaya $18.00
by Arifin Pasaribu $5.57
by - $12.00
by Sisca Soewitomo $7.00
by Rondang Pasaribu $6.00