Edna Adagogo-Brown, D. . “The Reign of King Douglas Jaja, Jeki IV, Amanyanabo of Opobo Kingdom in the Eastern Niger Delta, 1936-1980”. Kashere Journal of Humanities, Management and Social Sciences, vol. 4, no. 1, July 2022, https://journals.fukashere.edu.ng/index.php/kjhmss/article/view/71.