APA (7th ed.) Citation

Atkinson, A., & Bayly, C. A. (1989). Atlas of the British Empire. Facts on File.

Chicago Style (17th ed.) Citation

Atkinson, Alan, and C. A. Bayly. Atlas of the British Empire. New York: Facts on File, 1989.

MLA (9th ed.) Citation

Atkinson, Alan, and C. A. Bayly. Atlas of the British Empire. Facts on File, 1989.