by Sotar Baduara & Drs. S. Martin Sirait $6.00
by Bambang Dwiloka & Rati Riana $9.00
by Irawan Soejito $9.00
by Drs. G. Kartasapoetra, dkk $7.00
by Ir. Endar Sugiarto $9.00
by Donald J. Bawersok $12.00