Bukar, P. H., and M. A. Onoja. “ASSESSMENT OF HEAVY METALS IN OKRA (Abelmoschus Esculentus) CULTIVATED THROUGH IRRIGATION, IN MAIDUGURI, NIGERIA”. Open Journal of Environmental Research (ISSN: 2734-2085), vol. 1, no. 1, June 2020, pp. 59-70, doi:10.52417/ojer.v1i1.117.