by Mansur Samin $6.00
by Prof. Dr. Sondang P. Siagian, M.P.A $11.00
by Dr. Ir. Muhammad Rasyaf, MS $7.00
by Ir. Eddy Afrianto & Ir. Evi Liviawaty $7.00
by Hendra Nurtjahjo, S.H., M.Hum $7.00
by Drs. Daryanto $7.00