APA (7th ed.) Citation

Hall, D., & Foley, M. (2003). Modal verbs.

Chicago Style (17th ed.) Citation

Hall, Diane, and Mark Foley. Modal Verbs. 2003.

MLA (9th ed.) Citation

Hall, Diane, and Mark Foley. Modal Verbs. 2003.

Warning: These citations may not always be 100% accurate.