Ghana ilipata uhuru mwaka upi?
Kwame Nkrumah
"Negro History: European Government in Africa", The Lincolnian, 12 April 1938, p.2 (Lincoln University, Pennsylvania) - see 
Ghana: The Autobiography of Kwame Nkrumah (1957). ISBN 0-901787-60-4
Africa Must Unite (1963). ISBN 0-901787-13-2
African Personality (1963)
 (1965). ISBN 0-901787-23-X