Kgatla T.E and  Howard S.S. and  Hiss D.C.,  Colour Stability of Wild Cactus Pear Juice.   journal   = {International Journal of Nutrition and Food Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2011, vol. 56(8). 435 - 440
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/13087.