Otene, B. ., and S. . Iorchor. “Sediment Chlorophyll ‘a’ and Nutrients Characteristics of the Upper Bonny Estuary, Amadi-Ama Creek, Port Harcourt, Nigeria”. Scientific Journal of Biological Sciences, vol. 2, no. 1, Jan. 2013, pp. 17-23, https://www.sjournals.com/index.php/sjbs/article/view/1106.