by Drs. E. Sumaryono, MA $6.00
by ANNEKE PUTERI & AMALIA ZAHRA $6.00
by J.S. Badudu $13.00
by Ir. Ari Wijayani Purwanto $11.00
by ZAENAL RADAR T. $6.00
by Dr. Al. Purwa Hadiwardoyo, MSF. $4.00