APA (7th ed.) Citation

Keller, R., & Duenwald, K. (1998). A theory of linguistic signs. Oxford University Press.

Chicago Style (17th ed.) Citation

Keller, Rudi, and Kimberley Duenwald. A Theory of Linguistic Signs. Oxford: Oxford University Press, 1998.

MLA (9th ed.) Citation

Keller, Rudi, and Kimberley Duenwald. A Theory of Linguistic Signs. Oxford University Press, 1998.