Cita APA (7th ed.)
ebrary, Inc, Salkie, R., Busuttil, P., & Auwera, J. v. d. (2009). Modality in English: Theory and description. Mouton de Gruyter.
Cita Chicago (17th ed.)
ebrary, Inc, Raphael Salkie, Pierre Busuttil, i Johan van der Auwera. Modality in English: Theory and Description. Berlin ; New York: Mouton de Gruyter, 2009.
Cita MLA (9th ed.)
ebrary, Inc, et al. Modality in English: Theory and Description. Mouton de Gruyter, 2009.
Atenció: Aquestes cites poden no estar 100% correctes.