APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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