by Vincent Gaspersz $7.00
by Prof. Dr. Sondang P. Siagian, M.P.A $11.00
by Prof. Dr. Moh. Mahfud MD, S.H., S.U. $9.00
by D. Soesetro & Zein $6.00
by Ubaidilah Nugraha $9.00
by Pandji Anoraga, S.E, M.M $7.00