APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Keller, Rudi. A Theory of Linguistic Signs. Oxford ; New York: Oxford University Press, 1998.

MLA (8th ed.) Citation

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