by Drs. Save M. Dagun $7.00
by Maurice Duverger $7.00
by Dr. Ronald Hutapea, SKM, Ph.D $9.00
by H. Rahmat Rukmana $6.00
by Drs. M. Dalyono $9.00
by Dra. Ahmad Rohani H.M., M.Pd $9.00