APA (7th ed.) Citation

Buchanan, K. (1953). The northern region of Nigeria: The geographical background of its political duality. American Geographical Society.

Chicago Style (17th ed.) Citation

Buchanan, Keith. The Northern Region of Nigeria: The Geographical Background of Its Political Duality. New York: American Geographical Society, 1953.

MLA (9th ed.) Citation

Buchanan, Keith. The Northern Region of Nigeria: The Geographical Background of Its Political Duality. American Geographical Society, 1953.

Warning: These citations may not always be 100% accurate.