by Hery Suhersono $12.00
by Prof. DR. Taliziduhu Ndraha $11.00
by ISEI $18.00
by Drs. Zulkifli Amzah, Msc $13.00
by Eric Shanower $11.00
by Dr. H. Abuddin Nata, MA $7.00
by - $5.00