APA (7th ed.) Citation

Powys, J. C. (1951). Porius: A romance of the dark ages. Macdonald.

Chicago Style (17th ed.) Citation

Powys, John Cowper. Porius: A Romance of the Dark Ages. London: Macdonald, 1951.

MLA (9th ed.) Citation

Powys, John Cowper. Porius: A Romance of the Dark Ages. Macdonald, 1951.

Warning: These citations may not always be 100% accurate.