Lomeling, D., and A. A. Abass. “Variability of Cone Index on Seedling Emergence Rate and Growth Establishment of Cowpea in a Sandy Loam Soil (Eutric Leptosol)”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 14, no. 1, Feb. 2014, pp. 34-48, https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/1733.