by Sam Chan $9.00
by Richard G. Lipsey & Peter O. Steiner $16.00
by Drs. Amin Widjaja Tunggal, Ak., M.B.A $9.00
by Drs. H.M. Yacob Ibrahim $11.00
by Prof. Dr. Husaini Usman, M.Pd dan R. Purnomo Setiady Akbar, S.Pd., M.Pd $6.00
by Drs. Save M. Dagun $9.00