by Syahrin Harahap $9.00
by Drs. CST. Kansil, S.H $12.00
by Prof. DR. H. Abdul Muis Ba'dulu & Hermann, S.Ag., M.Pd $7.00
by Swasono, Sri-Edi $5.00
by Prof. Dr. S. Nasution, M.A. $9.00
by Prof. DR. Taliziduhu Ndraha $9.00