APA (7th ed.) Citation

Frere, S. (1967). Britannia: A history of Roman Britain. Harvard University Press.

Chicago Style (17th ed.) Citation

Frere, Sheppard. Britannia: A History of Roman Britain. Cambridge, Mass.: Harvard University Press, 1967.

MLA (9th ed.) Citation

Frere, Sheppard. Britannia: A History of Roman Britain. Harvard University Press, 1967.