by Supomo $7.00
by Prof. Dr. Sondang P. Siagian, M.P.A $9.00
by Drs. Robinson Tarigan, M.R.P $11.00
by Tb. Ace Hasan syadzily $12.00
by Karl May $6.00
by Chris Lowney $16.00
by $13.00
by K. Usman $5.00
by Laura Khalida $7.00
by Ade S $5.00
by Alexander Ripley $26.00
by Is Mujiarso dkk $9.00