APA (7th ed.) Citation

Smyth, A. P. (1977). Scandinavian kings in the British Isles, 850-880. University Press.

Chicago Style (17th ed.) Citation

Smyth, Alfred P. Scandinavian Kings in the British Isles, 850-880. Oxford: University Press, 1977.

MLA (9th ed.) Citation

Smyth, Alfred P. Scandinavian Kings in the British Isles, 850-880. University Press, 1977.