APA (7th ed.) Citation

Lewis, C. P. (1991). The early earls of Norman England.

Chicago Style (17th ed.) Citation

Lewis, C. P. The Early Earls of Norman England. 1991.

MLA (9th ed.) Citation

Lewis, C. P. The Early Earls of Norman England. 1991.

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