The following links will take you to Amazon.com where you can purchase these great aids for writing your screenplay. Most are offered at a price below retail, so if you get one of those shipping specials, you'll make out like a bandit. A prime recommendation is the Screenwriter's Bible, right there at the top.

	The Screenwriter's Bible by David Trottier		Screenwriting 101: The Essential Craft of Feature Film Writing by Neill D Hicks
	Elements of Style for Screenwriters by Paul Argentini		How Not to Write a Screenplay: 101 Common Mistakes Most Screenwriters Make by Denny Martin Flinn
	Creating Unforgettable Characters by Linda Seger		Making a Good Writer Great: A Creativity Workbook for Screenwriters by Linda Seger, Silman-James Press
	The Tools of Screenwriting: A Writer's Guide to the Craft and the Elements of a Screenplay by David Howard, Edward Mabley (Contributor), Frank Daniel (Introduction)		Secrets of Screenplay Structure: How to Recognize and Emulate the Structural Frameworks of Great Films by Linda J. Cowgill
	Selling a Screenplay: The Screenwriter's Guide to Hollywood by Syd Field		How to Write a Selling Screenplay: A Step-By-Step Approach to Developing Your Story and Writing Your Screenplay by One of Today's Most Successful Screenwriters and Teachers by Christopher Keane, Julius Epstein (Foreword)
	500 Ways to Beat the Hollywood Script Reader : Writing the Screenplay the Reader Will Recommend by Jennifer Lerch		You Can Write a Movie (You Can) by Pamela Wallace
	Complete Idiot's Guide to Screenwriting by Skip Press		Afi Writing Great Screenplays for Film and TV (Writing Great Screenplays for Film and Tv, 2nd Ed) by Dona Cooper
	The Elements of Screenwriting by Irwin R Blacker		Laughing Out Loud: Writing the Comedy-Centered Screenplay by Andrew Horton
	Writing Treatments That Sell: How to Create and Market Your Story Ideas to the Motion Picture and TV Industry by Chi-Li Wong, Kenneth J. Atchity		Writing the Second Act: Building Conflict and Tension in Your Film Script by Michael Halperin
	Writer's Guide to Hollywood Producers, Directors, and Screenwriter's Agents, 2002-2003: Who They Are! What They Want! And How to Win Them Over! by Skip Press		The Perfect Pitch: How to Sell Yourself and Your Movie Idea to Hollywood by Ken Rotcop, James K. Shea, Marlane McGarry (Editor)
	The Writer Got Screwed (but didn't have to) : Guide to the Legal and Business Practices of Writing for the Entertainment Industry by Brooke A Wharton		Story: Substance, Structure, Style and The Principles of Screenwriting by Robert McKee