APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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

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