by Abdul Hakim G.N, S.H $6.00
by Ir. Doli Siregar, M.Sc., FRICS., SVC $11.00
by Drs. H. Burhanuddin Salam, M.M $11.00
by Drs. Khaelany H.D., M.A. $9.00
by Drs. Soemarso, S.R $16.00
by Drs. Husein Umar, S.E., M.M., MBA $9.00