APA (7th ed.) Citation

Palmer, F. R. (1990). Modality and the English modals (2nd ed.). Longman.

Chicago Style (17th ed.) Citation

Palmer, F. R. Modality and the English Modals. 2nd ed. London: Longman, 1990.

MLA (9th ed.) Citation

Palmer, F. R. Modality and the English Modals. 2nd ed. Longman, 1990.