Alfa, Josiah Atabo. “Performance of Sorghum Soyabean Intercrop As Influenced by Cultivar and Row Arrangement in the Northern Guinea Savanna Vegetational Belt of Nigeria”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 24, no. 5, Nov. 2015, pp. 184-03, https://gssrr.org/JournalOfBasicAndApplied/article/view/4568.