Aworinde, D. O., B. O. Ogundairo, S. M. Erinoso, and O. J. Sharaibi. “Foliar Epidermal and Petiole Anatomical Studies of Some Nigerian Species of Ipomoea (Convolvulaceae)”. Current Botany, vol. 4, no. 3, Dec. 2013, pp. 55-58, https://updatepublishing.com/journal/index.php/cb/article/view/1444.