by Drs. Djalinus Syah $7.00
by Jo Condrill & Bennie B., Ph.D $7.00
by Ir. Yushinta Fujaya, M.Si $7.00
by Drs. G. Kartasapoetra $7.00
by Muljana, B.S $9.00
by Prof. Dr. Sudarwan Danim $11.00