All of the resources listed below are publicly available via academic institutions or have been published openly on the web
MASTERS THESIS
Koerner, Kirsten "Enrico Cecchetti: Taking the Past Into the Future" (.pdf)
2001 76 pages
DOCTORAL DISSERTATION
Tidwell, Kathleen "The Cecchetti Council of America: A Focus on the Historical and Administrative Development of a Dance Organization"
1994 600 pages
SCHOLARLY ARTICLES, WEBSITES, AND YOUTUBE
New York Public Library exhibit online may be of interest to you; jam-packed with relevant facts
"500 Years of Italian Dance" http://web-static.nypl.org/exhibitions/italiandance/intro.html
Bennett, Toby
Cronshaw, Julie
Essays available on her website "The Cecchetti Connection" link provided as food for thought (some opinions may differ from those of our board)
YouTube Video: The Physical Principles of Classical Ballet Behind Cecchetti's 'Days of the Week'