APA (7th ed.) Citation

Gathorne-Hardy, G. M. (1956). A royal impostor: King Sverre of Norway. Oxford University Press ; H. Aschehoug & Co..

Chicago Style (17th ed.) Citation

Gathorne-Hardy, G. M. A Royal Impostor: King Sverre of Norway. London : Oslo: Oxford University Press ; H. Aschehoug & Co., 1956.

MLA (9th ed.) Citation

Gathorne-Hardy, G. M. A Royal Impostor: King Sverre of Norway. Oxford University Press ; H. Aschehoug & Co., 1956.