by Dr. Lijan Poltak Sinambel, M.M., M.Pd., dkk $9.00
by Julius R. Latumaerissa, S.E., M.M $9.00
by Erick Reidenbach $9.00
by Drs. H.M. Daryanto $7.00
by Drs. Daryanto $6.00
by Wahjosumidjo $13.00
by - $11.00