Ahmed, Y., E. Shalaby, and N. Shanan. “The Use of Organic and Inorganic Cultures in Improving Vegetative Growth, Yield Characters and Antioxidant Activity of Roselle Plants (<i>Hibiscus sabdariffa</I> L.)”. African Journal of Biotechnology, vol. 10, no. 11, Aug. 2013, pp. 1988-96, doi:10.4314/ajb.v10i11.