5Charles Sanders Peirce, Peirce on Signs: Writings on Semiotic, edited by James Hoopes, Chapel Hill: University of North Carolina Press, 1991, pp. 131 - 133.
6Charles Sanders Peirce, Collected Papers of Charles Sanders Peirce: Volume 2, Elements of Logic, edited by Charles Hartshorne and Paul Weiss, Cambridge: Harvard University Press, 1932, p. 143.
7Charles Sanders Peirce, Peirce on Signs: Writings on Semiotic, edited by James Hoopes, Chapel Hill: University of North Carolina Press, 1991, p. 251.
8Charles Sanders Peirce, Collected Papers of Charles Sanders Peirce: Volume 2, Elements of Logic, edited by Charles Hartshorne and Paul Weiss, Cambridge: Harvard University Press, 1932, p. 159.
9David Deacon, Michael Pickering, Peter Golding, Graham Murdock, Researching Communications: A Practical Guide to Methods in Media and Cultural Analysis, London : Arnold, 1999.
10Mary Ann Doane, 'The Indexical and the Concept of Medium Specificity', Difference, 2006, vol. 18 (1), pp. 128- 152.
