APA (7th ed.) Citation

Schultze, A., & Benton, P. A. (1968). The Sultanate of Bornu (1st ed. new impression.). Cass.

Chicago Style (17th ed.) Citation

Schultze, Arnold, and Philip Askell Benton. The Sultanate of Bornu. 1st ed. new impression. London: Cass, 1968.

MLA (9th ed.) Citation

Schultze, Arnold, and Philip Askell Benton. The Sultanate of Bornu. 1st ed. new impression. Cass, 1968.