Ogbuagu Ugorji Udensi, and Ndem E. Edu. “Evaluation and Identification of Genetic Variation Pattern in Cowpea [Vigna Unguiculata (L.) Walp] Accessions Using Multivariate Analyses”. Journal of Basic & Applied Sciences, vol. 11, Jan. 2015, pp. 149-58, doi:10.6000/1927-5129.2015.11.22.