by Ir. Budi Sulistyo $7.00
by Istimawan Dipohusodo $18.00
by Archie J. Bahm $7.00
by Drs. Agus M. Hardjana, M.Sc., Ed $6.00
by Yudhis M.Burhanuddin $10.00
by Pandiwinoto C.P $6.00