The Oxford dictionary of the Middle Ages
MLA
Bjork, Robert E. The Oxford Dictionary of the Middle Ages. Oxford: Oxford University Press, 2010
APA, 7th edition
Bjork, R. E. (2010). The Oxford dictionary of the Middle Ages. Oxford: Oxford University Press
Chicago, 17th edition
Bjork, Robert E. The Oxford dictionary of the Middle Ages. Oxford: Oxford University Press, 2010