by TE Behrend $9.00
by T. Mulya Lubis, Richard M. Buxbaum $30.00
by W.P. Groeneveldt $9.00
by Truman Simanjuntak, Bagyo Prasetyo, Retno Handini $10.00
by Suhario Padmodiwirio $6.00
by Sulistyowati Irianto, Antonius Cahyadi $18.00