These are just some acc sources. Please use 2 from here and any other 3 of your choice.
RE-THINKING OBJECTIVITY. (cover story) in Columbia Journalism Review, BY Cunningham, Brent, 2003, article
Journalism after September 11, by Zelizer, Barbie; Allan, Stuart, BOOK
Signs: an introduction to semiotics by Sebeok Thomas A., 2001 BOOK
Models and semiotic theory in The forms of meaning: modeling systems theory and semiotic analysis