by J. Donald Walters $5.00
by Murdifin Haming, S.E., M.Si & Dr. Mahfud Numajamuddin, S.E., M.M $0.00
by K. Usman $6.00
by Fredy Rangkuti $9.00
by Wahyuni Mulyawati & Ilse Harahap $7.00
by $20.00