Lashin, G.M., Azab, A.A., Hussien, A.A. and Anwar, A.E. 2013. Effects of plant extracts on growth, yield and protein content of cowpea (Vigna unguiculata (L.) Walp.). Bangladesh Journal of Botany. 42, 1 (Jul. 2013), 99–104. DOI:https://doi.org/10.3329/bjb.v42i1.15870.