by Freddy Rangkuti $11.00
by Ir. H. Nazarukhan Yasin $18.00
by Prof. J. Suprapto, M.A. APU $11.00
by T. Mulya Lubis, Richard M. Buxbaum $30.00
by Harun M. Husein, S.H $11.00
by Drs. Djalinus Syah $11.00