by Dr. Ir. M. Imadduddin Abdul Rahim, M.Sc $7.00
by J. Donald Walters $5.00
by Prof. Drs. H. A. W. Widjaja $6.00
by H. Hartono, A. Ma. Pd $6.00
by Edilius, S.E dan Drs. Sudarsono, S.H., M.Si $11.00
by $4.00