by Michael P. Todaro $18.00
by Panut Djojosumarto $9.00
by Prof. Dr. Sondang P. Siagian, M.P.A $7.00
by Erie Sudewo $6.25
by Amat Jutawan $6.00
by Prof. Dr. Sri Mulyani E. S $12.00
by Rofi'l $5.00
by Syaiful F. Prihadi $11.00