Here’s my recommendations:

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

If you know of others that have really helped you, let us know by adding a comment.