by Ir. Hatta Sunanta, B.Sc., MS $6.00
by dr. Yoannes Y. Laban $5.00
by Prof. drh. Charles Rangga Tabbu, M.Sc., Ph.D $18.00
by ISEI $18.00
by Bhisma Murti $7.00
by Ir. M. Lies Suprapti $7.00