by J. Donald Walters $5.00
by Andang, Al $6.00
by Drs. Muhsin M.K. S.Ag, M.Sc $7.00
by Drs. H. Basri Iba Asghary $11.00
by Anton Gerbono & Abbas Siregar Djarijah $7.00
by Ashadi Siregar & I Made Suarjana $6.00