by Drs. Safri Nurmantu MSi $9.00
by Dr. Sofyan Syafri Harahap, M.S,Ac $7.00
by Elmi, Bachrul $7.00
by Drs. Marcel Go, M.S $7.00
by Zainuddin HM $5.28
by Jopie Jusuf $11.00