by Ir. Sarjoni Basri $7.00
by Drs. Sudarso $7.00
by M.T. Al-Hadadi, Terj. Drs. H. Zainuddin $7.00
by Ir. Budi Samadi & Ir. Bambang Cahyono $7.00
by Drs. G. Kartasapoetra $9.00
by Dr. Soemiarti Patmonodewo $7.00