Eco, U., & Sebeok, T. A. (1988). The Sign of three: Dupin, Holmes, Peirce (1st Midland bk. ed.). Indiana University Press.
芝加哥风格引文Eco, Umberto, 与 Thomas A. Sebeok. The Sign of Three: Dupin, Holmes, Peirce. 1st Midland bk. ed. Bloomington: Indiana University Press, 1988.
MLA引文Eco, Umberto, 与 Thomas A. Sebeok. The Sign of Three: Dupin, Holmes, Peirce. 1st Midland bk. ed. Indiana University Press, 1988.
警告：这些引文格式不一定是100％准确.