APA (7th ed.) Citation

Sayers, D. L. (1951). The emperor Constantine: A chronicle. Gollancz.

Chicago Style (17th ed.) Citation

Sayers, Dorothy L. The Emperor Constantine: A Chronicle. London: Gollancz, 1951.

MLA (9th ed.) Citation

Sayers, Dorothy L. The Emperor Constantine: A Chronicle. Gollancz, 1951.