APA (7th ed.) Citation

Speed, P., & Speed, M. (1989). The Middle Ages. Oxford Univ. Press.

Chicago Style (17th ed.) Citation

Speed, Peter, and Mary Speed. The Middle Ages. Oxford: Oxford Univ. Press, 1989.

MLA (9th ed.) Citation

Speed, Peter, and Mary Speed. The Middle Ages. Oxford Univ. Press, 1989.

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