APA (7th ed.) Citation

Johnson, P. A. (1988). Duke Richard of York, 1411-1460. Clarendon Press ; Oxford University Press.

Chicago Style (17th ed.) Citation

Johnson, P. A. Duke Richard of York, 1411-1460. Oxford : New York: Clarendon Press ; Oxford University Press, 1988.

MLA (9th ed.) Citation

Johnson, P. A. Duke Richard of York, 1411-1460. Clarendon Press ; Oxford University Press, 1988.