APA (7th ed.) Citation

Jackson, W. T. H. (1960). The literature of the Middle Ages. Columbia University Press.

Chicago Style (17th ed.) Citation

Jackson, W. T. H. The Literature of the Middle Ages. New York: Columbia University Press, 1960.

MLA (9th ed.) Citation

Jackson, W. T. H. The Literature of the Middle Ages. Columbia University Press, 1960.