by Ir. Eddy Afrianto & Ir. Evi Liviawaty $6.00
by Risman, Drs. $9.00
by Prof. Dr. Jur Andi Hamzah $7.00
by WK $13.00
by I Kethut Ardhana $18.00
by WK $11.00
by Drs. H. Chaeruman Pasaribu $9.00