by Dr. Sofyan Syafri Harahap, M.S,Ac $11.00
by Hermawan Kartajaya $11.00
by Andrew E. B. Tani $18.00
by Wirakusumah, Sambas $9.00
by Dr. Hj. Zaitunah Subhan $7.00
by Drs. Surajiyo $9.00