by Dr. Sjarkawi, M.Pd $7.00
by Drs. Tjahya Supriatna, M.S $9.00
by Drs. Robinson Tarigan, M.R.P $11.00
by Edgar Morin $6.00
by K. Usman $5.00
by Prof. Dr. S. Nasution, M.A. $7.00