Despite the impression of reading Master Yoda for 500 pages (100 pages of notes and bibliography! Ouch) this book remains a reference for key it delivers to anyone who wants to understand the double language of myths and legends.
Its cheap reissue was expected, as speculation over the works of this author has become out of proportion!
Let's say it bluntly: Read the Joseph Campbell, it does well in society but it does not make you a writer / Dialogue. Even with his complete works.
At best you will write a fairy tale, but a feature film, you have to go through treaties McKee, Truby, and all their Anglo-Saxon peers. Besides personal experience, irreplaceable.
And a strong dose of humility that will eliminate many soooo talented aspirants.