APA (7th ed.) Citation

Noble, T., & Engen, J. V. (2012). European Transformations: The Long Twelfth Century.

Chicago Style (17th ed.) Citation

Noble, Thomas, and John Van Engen. European Transformations: The Long Twelfth Century. 2012.

MLA (9th ed.) Citation

Noble, Thomas, and John Van Engen. European Transformations: The Long Twelfth Century. 2012.