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3. Manda, Excavations at an Island Port on the Kenya Coast, The British Institute in Eastern Africa, Memoir 9. University Press Oxford: Oxford, UK, 1984; 65.
4. Appendix in The Zimbabwe Culture: Ruins and Reactions, (ed). Frank Cass: London, 1971; 185.
5. The beads of the Mapungubwe district. In Mapungubwe, (ed). Cambridge University Press: Cambridge, 1937; 104.