by Robert P. Masland $7.00
by Vincent Gaspersz $13.00
by Rachmadi Usman, S.H $11.00
by Sudarsono Soedomo $5.04
by Prof. Dr. Sondang P. Siagian, M.P.A $11.00
by Prof. Dr. Sondang P. Siagian, M.P.A $7.00
by Emmanuel Subangun $6.00