N. Ehisianya, C., and J. C. Njoku. “Relative Abundance of Sweetpotato Whitefly in Orange-Fleshed Sweetpotato Cultivars at Umudike, South-East Nigeria”. Uganda Journal of Agricultural Sciences, vol. 15, no. 2, Sept. 2014, pp. 157-64, http://journal.naro.go.ug/index.php/ujas/article/view/383.