Another good source for reliable overviews on many subjects from sources like Encyclopedia of Religion, The New Dictionary of the History of Ideas, The Encyclopedia of Genocide and Crimes Against Humanity, and biographical sources.
Addresses the history of African cultures from the pharaohs and the ancient civilizations of the south through the colonial era to the emergence of 53 independent countries, some of them newly emergent in world commerce and others deep in conflict. Covers issues facing the continent such as global development, the AIDS crisis, and international terrorism.
Routledge Handbook of African Literature (e-book) by 
New Encyclopedia of Africa
Encyclopedia of African History & Culture
Encyclopedia of the African Diaspora (e-book)
