APA (7th ed.) Citation

Thom, P. (2003). Medieval modal systems: Problems and concepts. Ashgate.

Chicago Style (17th ed.) Citation

Thom, Paul. Medieval Modal Systems: Problems and Concepts. Aldershot, Hants. [u.a.]: Ashgate, 2003.

MLA (9th ed.) Citation

Thom, Paul. Medieval Modal Systems: Problems and Concepts. Ashgate, 2003.