by Sirnuh $7.00
by Richard G. Lipsey & Peter O. Steiner $18.00
by Drs. Thomas Suyatno, dkk $9.00
by Joe Girard $7.00
by Drs. Jumingan, S.E., M.M., M.Si $0.00
by Baum, Warren C & Stokes M. Tolbert $9.00