Waliyullahi, Abimbola Damilola. 2016. “A Comparative Study of Ivan the Fourth and Alaafin Sango of Oyo Empire”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 27 (2):34-41. https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/5700.