by Bambang Agus Murtidjo $6.00
by Paul J. Wharton $4.00
by Lisa O. Engelhardt $3.00
by Ir. Eddy Afrianto & Ir. Evi Liviawaty $6.00
by $7.00
by Ir. Abbas Siregar Djarijah & Nunung Marlina Djarijah $6.00