by $4.00
by Ir. Eddy Afrianto & Ir. Evi Liviawaty $6.00
by A. Widyamartaya, B.A $4.00
by Ag. Sri Oktri Hastuti $5.00
by Drs. Agus M. Hardjana, M.Sc., Ed $5.00
by Hikmat Budiman $11.00