by Ir. M. Lies Suprapti $6.00
by Dr. Ir. Adji Sastrosupadi, MS $11.00
by Ir. Lisdiana Fachruddin $5.00
by Lisa O. Engelhardt $3.00
by Ir. Hieronymus Budi Santoso $5.00
by Siti Rahayu - Titiek F. Djaafar-Wiryatmi $5.00