Cita APA (7th ed.)

Perkins, W. A., & Stembridge, J. H. (1957). Nigeria: A descriptive geography. Oxford University Press.

Cita Chicago (17th ed.)

Perkins, William A., i Jasper H. Stembridge. Nigeria: A Descriptive Geography. London: Oxford University Press, 1957.

Cita MLA (8th ed.)

Perkins, William A., i Jasper H. Stembridge. Nigeria: A Descriptive Geography. Oxford University Press, 1957.