by N. Wahyu Sulistiyana $6.00
by N. Edy Soetanto, BE. $5.00
by Ir. Setijo Pitojo $6.00
by Ir. Dudung Abdul Muslim $9.00
by Prof. Dr. Sri Mulyani E. S $12.00
by Anwar Hudijono & Anshari Thayib $12.00