Uhegbu, Friday O., et al. “Cyanide, Nitrate and Nitrite Content of Some Leafy Vegetables and Fruits Commonly Consumed in the South-East of Nigeria”. Pakistan Journal of Nutrition, vol. 10, no. 12, Nov. 2011, pp. 1190–1194, https://doi.org/10.3923/pjn.2011.1190.1194.