by Drs. Husein Umar, S.E., M.M., MBA $13.00
by Drs. Firman B. Aji dan Drs. Martin Sirait $9.00
by Drs. G. Kartasapoetra $7.00
by Bilson Simamora $11.00
by Drs. Ajat Sudrajat $7.00
by - $6.00