APA (7th ed.) Citation

Bell, M., Butlin, R. A., & Heffernan, M. J. (1995). Geography and imperialism, 1820-1940. University Press.

Chicago Style (17th ed.) Citation

Bell, Morag, R. A. Butlin, and Michael J. Heffernan. Geography and Imperialism, 1820-1940. Manchester [etc.]: University Press, 1995.

MLA (9th ed.) Citation

Bell, Morag, et al. Geography and Imperialism, 1820-1940. University Press, 1995.