by Freddy Rangkuti $9.00
by Arlyn J. Melcher $9.00
by Drs. Ec. Alex. S. Nitisemito dan Drs. M. Umar Burham. M.S $6.00
by Dennis L. Poster $9.00
by Nyoman S. Pendit $18.00
by Sartono Kartodirdjo $12.00