Daramy, Moses Ahmed, et al. “Effects of Residual Fertility and Cowpea Residues on Succeeding Maize Growth and Yield in Ghana”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 33, no. 3, June 2017, pp. 227-35, https://gssrr.org/JournalOfBasicAndApplied/article/view/7204.