Ajayi, Abiola Toyin. “Relationships Among Drought Tolerance Indices and Yield Characters of Cowpea (Vigna Unguiculata L. Walp)”. International Journal of Scientific Research in Biological Sciences 7, no. 5 (October 31, 2020): 93–103. Accessed April 11, 2025. https://ijsrbs.isroset.org/index.php/j/article/view/404.