by Prof. DR. Ir. H. Tridoyo Kusumastanto, MS $9.00
by Dr. J. Kaloh $9.00
by Prof. Hazairin, S.H $7.00
by Soewarsono $6.00
by Prof. DR. Taliziduhu Ndraha $11.00
by Prof. Dr. Machasin MA (ed.) $7.00