↑ "Pangani Basin". Pangani Basin Water Board. Archived from the original on 21 October 2011. Retrieved 9 October 2011.
↑ Marean, Curtis W., and John J. Shea. "Archaeological reconnaissance of the Mkulumuzi and Sigi river valleys, Tanga District, Tanzania." Nyame akuma 45 (1996): 72-81.
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