by Ir. Rustam Hakim, M.T., IALI & Dr. Ing. Ir. Eka SediadiR., IAI $9.00
by Dwigh Waldo $7.00
by Norman A. Hart $9.00
by Prof. Dr. Sondang P. Siagian, M.P.A $11.00
by Mawlana Abul A'la Mawdudi $6.00
by Prof. DR. Taliziduhu Ndraha $11.00