by Anwar, Moh. Arsjad, dkk $11.00
by Freddy Rangkuti $9.00
by Dwi Winarno, S.Pd., M.Si $9.00
by Drs. Save M. Dagun $9.00
by Uli Kozok $10.00
by Drs. Bambang S., dkk $9.00