by Ahmad Azma Dz $6.73
by Darmadi Durianto, Sugiarto, dkk $7.00
by Hendri Ma'ruf $11.00
by Drs. Zulkifli Amzah, Msc $13.00
by Syahrin Harahap $9.00
by Drs. Muchdarsyah Sinungan $9.00