There's Cyril Beaumont's
A Manual of the Theory and Practice of Classical Theatrical Dancing (Cecchetti method). Lots of copies are available through Amazon (link above).
For a video, there's:
Cecchetti video:" Ballet: The Tradition of Cecchetti"You can also check out the website of The Cecchetti Council of America. There's a lot of information there, people to contact, and a few informative articles, like the detailed one on épaulement.
Cecchetti Council of America websiteLook on their ordering page for more books, an instructional Cecchetti video, CDs of Cecchetti music for all levels of the syllabus, a DVD for children's Grades One and Two, and Cecchetti syllabus booklets. Only hitch is you must be a paying member of the Council to buy most of these items.
And, btw, here's where you are allowed to use the word "method" -- It's the Cecchetti Method, not the Cecchetti Style.