APA-ийн эшлэл(7 дахь хэвлэлт)

Eco, U., & Sebeok, T. A. (1988). The Sign of three: Dupin, Holmes, Peirce (1st Midland bk. ed.). Indiana University Press.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Eco, Umberto, ба Thomas A. Sebeok. The Sign of Three: Dupin, Holmes, Peirce. 1st Midland bk. ed. Bloomington: Indiana University Press, 1988.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Eco, Umberto, ба Thomas A. Sebeok. The Sign of Three: Dupin, Holmes, Peirce. 1st Midland bk. ed. Indiana University Press, 1988.