by Ir. H. Rahmat Rukmana, MBA., MSc. $5.00
by Milton Chen, Ph.D. $9.00
by Suhardo & A. Hadiwiyata $3.00
by Abdul Halim Abu Syuqqah $12.00
by Yusuf Abdullah Daghfag $6.00
by Amru Yusuf $6.00