1. Adewale, B.D., Adeigbe, O.O., & Aremu, C.O. (2011). Genetic distance and diversity among some cowpea (Vigna unguiculata (L.) Walp.) genotypes. International Research Journal of Plant Science, 1(2), 9-14.
2. Afiukwa, C.A., Ubi, B.E., Kunert, K.J., Titus, E.J., & Akusu, J.O. (2013). Seed protein content variation in cowpea genotypes. W.J. Agric. Sci.,1,94-99.
3. Akande, S.R., Olakojo, S.A., Ajayi, S.A., Owolade, O.F., Adetumbi, J.A., Adeniyan, O.N., & Ogunbodede, B.A. (2012). Planting date affects cowpea seed yield and quality at Southern Guinea savanna, Nigeria. Seed Technology, 34(1), 879-888.
4. Akdağ, C. (1995). Sıra aralıklarının Tokat-Kazova şartlarında börülce (Vigna sinensis (L.) savi)’nin verim ve verim unsurlarına etkileri. Gaziosmanpaşa Üniversitesi Ziraat Fakültesi Dergisi, 12 (1), 141-146.
5. FAO, (2020). http://www.fao.org/faostat/en/#data/QC.