Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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