by A. Tresna Sastrawijaya, M.Sc $7.00
by Drs. Muchdarsyah Sinungan $12.00
by PK Poerwantana $9.00
by Richard G. Lipsey & Peter O. Steiner $16.00
by Harry Simons $13.00
by SMP Tjondronegoro, Gunawan Wiradi $25.00