by Tierney $18.00
by Ir. Eddy Afrianto & Ir. Evi Liviawaty $6.00
by Bambang Agus Murtidjo $6.00
by Aziz Alimul $9.00
by Djoehana Setyamidjaja, M.Ed $7.00
by Ig. Cahyo Irwanto, Pr. $4.00
by Jansen Silalahi $7.00