by Fredy Rangkuti $9.00
by Anwar, Moh. Arsjad, dkk $6.00
by Drs. G. Kartasapoetra $7.00
by P. A. Elliot $9.00
by Hermawan Kartajaya & Yuswohady $9.00
by Drs. Agus M. Hardjana, M.Sc., Ed $6.00