Tohutoro APA (7th ed.)
Portner, P. (2009). Modality. Oxford University Press.
Tohutoru Kātū Chicago (17th ed.)
Portner, Paul. Modality. Oxford ; New York: Oxford University Press, 2009.
Tohutoro MLA (9th ed.)
Portner, Paul. Modality. Oxford University Press, 2009.
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