Foundations of an African Civilisation: Aksum and the northern Horn, 1000 BC - AD 1300
Ancient Churches of Ethiopia. Yale University Press, New Haven, 2009.
ISBN9780300141566
References
'PHILLIPSON, Prof. David Walter', Who's Who 2013, A & C Black, an imprint of Bloomsbury Publishing plc, 2013; online edn, Oxford University Press, Dec 2012 ; online edn, Nov 2012
accessed 5 March 2013