by Prof. Dr. S. Nasution, M.A. $7.00
by Prof. Drs. H. A. W. Widjaja $9.00
by John Salindeho $7.00
by Dr. Budi Tri Akoso $11.00
by Ir. H. Rahmat Rukmana $5.00
by Prof. Dr. H. Abdurrahmat Fathoni, M.Si $11.00