NEW Phone Hacking book

This has been extensively previewed in The Guardian through Roy Greenslade's column if you're feeling too fiscally challenged to purchase a copy; contains chapters on the history of press regulation, takes things up to date, and includes proposals for the future of press regulation - rather neatly spanning the ground you have to cover for your exam...
You can find the Guardian previews by googling 'guardian the phone hacking scandal: journalism on trial*'

This book on Amazon;
Guardian short book on hackgate;
another hackgate book;
Michael Wolff's The Man Who Owned the News: Inside the Secret World of Rupert Murdoch (look at the 'Customer who bought this also bought' list for more useful reads - this one has the 'Look Inside' feature meaning you can preview some content for free and take notes).
If you're doing business, Murdoch/NewsCorp makes for a great case study - including the current moves to shift him out of NewsCorp by shareholders.