by Layman Tower Sargent $9.00
by T.F. Honour dan R.M. Mainwaring $11.00
by Eddy Tano, Dipl. Chem. Eng. $7.00
by Prof. DR. Koentjaraningrat $11.00
by - $11.00
by Dr. Maryaeni, M.Pd $6.00
by Opik $6.00