APA (7th ed.) Citation

Lyon, B. D. (1972). The origins of the Middle Ages: Pirenne's challenge to Gibbon ([1st ed.].). Norton.

Chicago Style (17th ed.) Citation

Lyon, Bryce Dale. The Origins of the Middle Ages: Pirenne's Challenge to Gibbon. [1st ed.]. New York: Norton, 1972.

MLA (9th ed.) Citation

Lyon, Bryce Dale. The Origins of the Middle Ages: Pirenne's Challenge to Gibbon. [1st ed.]. Norton, 1972.