APA (7th ed.) Citation

Udo, R. K. (1970). Geographical regions of Nigeria / by R.K. Udo. Heinemann.

Chicago Style (17th ed.) Citation

Udo, Reuben K. Geographical Regions of Nigeria / by R.K. Udo. Heinemann, 1970.

MLA (9th ed.) Citation

Udo, Reuben K. Geographical Regions of Nigeria / by R.K. Udo. Heinemann, 1970.

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