APA (7th ed.) Citation

Lyon, B. D. (1964). The high Middle Ages, 1000-1300. Free Press.

Chicago Style (17th ed.) Citation

Lyon, Bryce Dale. The High Middle Ages, 1000-1300. New York: Free Press, 1964.

MLA (9th ed.) Citation

Lyon, Bryce Dale. The High Middle Ages, 1000-1300. Free Press, 1964.