by Prof. Dr. S. Nasution, M.A. $7.00
by G. Kartasapoetra dan R. G. Kartasapoetra, S.H $6.00
by Helmut Morsbach, dkk $7.00
by Prof. Dr. Sondang P. Siagian, M.P.A $7.00
by Imam Tholkhah $9.00
by Dr. Ibrahim Bafadal, M.Pd $6.00