by Ir. Jarot Wijanarko $9.00
by Zulkifli Zakaria $5.00
by Robert Cole $7.00
by Dr. Abdurrahman Qadir, MA $6.00
by Dr. Nashir al-Aql $5.00
by Ir. Dedy Heryadi Sutisna, MS & Ratno Sutarmanto $6.00