by H. Rahmat Rukmana $6.00
by Hefni Effendi $9.00
by Dr. Ir. Muhammad Rasyaf, MS $6.00
by Drs. Wartono Hadie & Dra. Lies Emmawati Hadie $6.00
by Ir. Nur Tjahjadi $6.00
by Sumantoro $7.00