Thompson, A. B.; A. Bulirani (1993). "Growth of usipa (Engraulicypris sardella) in Lake Malawi/Niassa". Papers presented at the Symposium on Biology, Stock Assessment and Exploitation of Small Pelagic Fish Species in the African Great Lakes Region. Bujumbura, Burundi, from 25 to 28 November 1992. FAO. Retrieved 2013-05-21.