by Mastenbroek, W.F.G. $7.00
by $5.00
by Ali Masjono Mukhtar, S.E., M.Bit $7.00
by Prof. Dr. H.A.R. Tilaar, MSc.Ed $11.00
by Hudoro Sameto, MBA $6.00
by Drs. H. Abu Ahmadi $9.00