by Ir. Suprio Guntoro
$6.00

by Prof. Dr. Sondang P. Siagian, M.P.A
$11.00

by Dwi Winarno, S.Pd., M.Si
$9.00

by Ir. Moehar Daniel, M.S & Ir. Darmawati, M.Sc & Ir. Nieldalina, M.Si
$7.00

by Ir. Bambang Cahyono
$6.00

by Mohamad Muslich, S.E., M.B.A
$7.00