APA (7th ed.) Citation

Simpson, J. (1990). Piers Plowman: An introduction to the B-text. Longman.

Chicago Style (17th ed.) Citation

Simpson, James. Piers Plowman: An Introduction to the B-text. London ; New York: Longman, 1990.

MLA (9th ed.) Citation

Simpson, James. Piers Plowman: An Introduction to the B-text. Longman, 1990.