O. Ogbemudia, F., N. Bassey, I., Kekere, O. ., & D. Udo, E. (2012). Concentrations of heavy metals in three commonly used medicinal vegetables in Akwa- Ibom state. Scientific Journal of Environmental Sciences, 1(2), 21-29. Retrieved from https://sjournals.com/index.php/sjes/article/view/1274