Ayoola, P.B., et al. “Trace Elements and Major Minerals Evaluation of Spondias Mombin, Vernonia Amygdalina and Momordica Charantia Leaves”. Pakistan Journal of Nutrition, vol. 9, no. 8, July 2010, pp. 755–758, https://doi.org/10.3923/pjn.2010.755.758.