by Ary Budiyanto $21.00
by Dr. Sofyan Syafri Harahap, M.S,Ac $7.00
by Squire, Lyn & Herman van der Tak $6.00
by Prof. Dr. Sondang P. Siagian, M.P.A $11.00
by Mauled Moelyono, S.E $6.00
by Richard Denny $7.00