APA (7th ed.) Citation

Casey, P. J. (1995). Carausius and Allectus: The British usurpers. Yale University Press.

Chicago Style (17th ed.) Citation

Casey, P. J. Carausius and Allectus: The British Usurpers. New Haven: Yale University Press, 1995.

MLA (8th ed.) Citation

Casey, P. J. Carausius and Allectus: The British Usurpers. Yale University Press, 1995.