Helmy, H. E., F. S. Taha, and E. A. Abd El-Motaal. 1994. “Treatments of Free Fatty Acids to Prevent or Decrease Colour Fixation in Cottonseed Oil”. Grasas Y Aceites 45 (6):375-79. https://doi.org/10.3989/gya.1994.v45.i6.1034.