Loos, Eugene E.; Susan Anderson; Dwight H. Day, Jr.; Paul C. Jordan; J. Douglas Wingate. "What is a deontic modality?". Glossary of linguistic terms. SIL International. Retrieved 2009-12-28.
Loos, Eugene E.; Susan Anderson; Dwight H. Day, Jr.; Paul C. Jordan; J. Douglas Wingate. "What is a commissive modality?". Glossary of linguistic terms. SIL International. Retrieved 2009-12-28.