by Gabriel A. Almond $13.00
by Dra. Hj. Etin Solihatin, M.Pd, Rahardjo, S.Pd $7.00
by Drs. Hari Amanto & Drs. Daryanto $7.00
by dr. Boyke Dian Nugraha $7.00
by Joe Vitale $11.00
by Lester R. Brown $21.00