by $6.00
by Richard G. Lipsey & Peter O. Steiner $16.00
by R. Ibrahim dan Nana Syaodih. S $7.00
by Drs. R. Martino $6.00
by Prof. J. Suprapto, M.A. APU $9.00
by Prof. DR. H. Abdul Muis Ba'dulu & Hermann, S.Ag., M.Pd $7.00