by Drs. H. Malayu S.P. Hasibuan $11.00
by Drs. Jumingan, S.E., M.M., M.Si $0.00
by Donald J. Bawersok $12.00
by P. Suhardiman $6.00
by Drs. Daryanto $11.00
by Ir. FX. Susanto $7.00