by Prof. drh. Charles Rangga Tabbu, M.Sc., Ph.D $18.00
by E. Martasudjita, Pr. J. Kristanto, Pr. $4.00
by Ir. Setijo Pitojo $6.00
by Sabaruddin $5.00
by Ir. Bambang Cahyono $6.00
by Bambang Agus Murtidjo $6.00