by Agus Setiawan $12.00
by Alex Wipperfurth $12.00
by Drs. Suwarna Pringgawidagda, M.Pd $18.00
by Drs. Husein Umar, S.E., M.M., MBA $13.00
by Prof. Dr. Soegijanto Padmo $7.00
by John D. Martin $9.00