APA (7th ed.) Citation

Nkrumah, K. (1967). Challenge of the Congo. International Pub.

Chicago Style (17th ed.) Citation

Nkrumah, Kwame. Challenge of the Congo. New York: International Pub, 1967.

MLA (9th ed.) Citation

Nkrumah, Kwame. Challenge of the Congo. International Pub, 1967.