by Prof. Subowo, dr. M.Sc., Ph.D $9.00
by Prof. Dr. Sondang P. Siagian, M.P.A $9.00
by Sawidji Widoatmodjo, S.E $9.00
by $7.00
by Drs. O.P. Simorangkir $9.00
by Soedarso $6.00