by Julius R. Latumaerissa, S.E., M.M $9.00
by Kerry Patterson, Joseph Grenny, Ron McMillan, Al Switzler $12.00
by Drs. Muchdarsyah Sinungan $9.00
by Harry Simons $12.00
by Istimawan Dipohusodo $18.00
by Heilbroner, Robert L $9.00