by Robert T. Kiyosaki $12.00
by Drs. Abdullah Ali, Drs. Misbandono, dan Ir. Eny Rahma $7.00
by Lembaga Demografi Fakultas Ekonomi UI $6.53
by Drs. Wasty Soemanto $9.00
by $13.00
by George R. Terry $9.00
by F. Budi Hardiman $9.00
by Winarsih, Dra. $9.00