APA (7th ed.) Citation

De Boer, B. (2001). The origins of vowel systems. Oxford University Press.

Chicago Style (17th ed.) Citation

De Boer, Bart. The Origins of Vowel Systems. Oxford: Oxford University Press, 2001.

MLA (9th ed.) Citation

De Boer, Bart. The Origins of Vowel Systems. Oxford University Press, 2001.