by Arifin Pasaribu $5.57
by Leo Suryadinata $4.61
by Mauled Moelyono, S.E $6.00
by Drs. H. Malayu S.P. Hasibuan $7.00
by Hans Dieter Evers, dkk. $24.00
by Drs. H. Hamdan Aini $9.00
by S. Mara Gd $9.00