by P. Efrem Zuba, CSsR. $3.00
by Dr. E.G. Brahmaputra Marjadi, M.P.H $7.00
by Parakkasi, Aminuddin $6.00
by $4.00
by Ir. Arifin Arief, M. P $5.00
by Prof. Dr. Soekartawi $7.00