by Drs. Suharto, dkk $7.00
by ISEI $12.00
by Yudi Hartono, dkk $6.00
by - $9.00
by Eko Priyo Pratomo, Ubadilah Nugraha $11.00
by Prof. Dr. Sondang P. Siagian, M.P.A $9.00