APA-referens (7:e uppl.)

Freadman, A. Peirce's second classification of signs: Anne Freadman. Peirce's doctrine of signs : theory, applications, and connections.(1996).

Chicago-referens (17:e uppl.)

Freadman, Anne. "Peirce's Second Classification of Signs: Anne Freadman." Peirce's Doctrine of Signs : Theory, Applications, and Connections.(1996) .

MLA-referens (8:e uppl.)

Freadman, Anne. "Peirce's Second Classification of Signs: Anne Freadman." Peirce's Doctrine of Signs : Theory, Applications, and Connections.(1996), .