Also well worth a read:
Writing Television Drama by Nicholas Gibbs
Writing Movies for Fun and Profit by Thomas Lennon & Robert Ben Garant
The Complete Book of Scriptwriting by J Michael Straczynski
Essential Reading for Screenwriters:
Poetics by Aristotle
The Hero with a Thousand Faces by Joseph Campbell
The Writer’s Journey: Mythic Structure for Writers by Christopher Vogler
Screenplay: The Foundations of Screenwriting by Syd Field
Story by Robert McKee
Save the Cat! by Blake Snyder
The 21st Century Screenplay by Linda Aronson
Doctor Who: The Writer’s Tale: The Final Chapeter by Russell T Davies and Benjamin Cook
The Insider’s Guide to Writing for Television by Julian Friedmann and Christopher Walker