by - $9.00
by Prof. DR. S.P. Siagian, M.P.A $9.00
by Booth, Anne $9.00
by Drs. H. Malayu S.P. Hasibuan $7.00
by Editor: Indra J. Piliang, T.A. Legowo $11.00
by Kirdi Dipoyudo $6.00
by - $6.00