Keller, R., & Duenwald, K. (1998). A theory of linguistic signs. Oxford University Press.
芝加哥风格引文Keller, Rudi, 与 Kimberley Duenwald. A Theory of Linguistic Signs. Oxford: Oxford University Press, 1998.
MLA引文Keller, Rudi, 与 Kimberley Duenwald. A Theory of Linguistic Signs. Oxford University Press, 1998.
警告：这些引文格式不一定是100％准确.