by Prof. S.H. Rewoldt $7.00
by Prof. Dr. Sondang P. Siagian, M.P.A $9.00
by Prof. M. Nasroen $7.00
by Drs. Heryando Palar, Drs. Asman Riald $12.00
by J. W. M. Bakker, SJ $7.00
by Drs. H. Abu Ahmadi $9.00