by Drs. Nanang Gojali, M.Ag $7.00
by Ravianto $6.00
by Drs. H. Malayu S.P. Hasibuan $7.00
by Prof. Dr. Sondang P. Siagian, M.P.A $7.00
by Prof. Dr. Sondang P. Siagian, M.P.A $11.00
by Prof. M. Nasroen $7.00