by Dr. R. Hutapea, SKM, Ph.D $7.00
by Prof. Dr. Sondang P. Siagian, M.P.A $7.00
by Nurcholis Madjid $9.00
by Ir. H. Nazarukhan Yasin $13.00
by Drs. Domi C. Matutina $12.00
by P. S. Siswoputranto $13.00