This classic book is still valuable today. Superb illustrations. The best description of artistry and technique available. Look for a copy in the library.
Biomechanics of Women’s Gymnastics, G. S. George, 1980. (Or is it 1979?)
I recall when it was first published I bought 10 copies to distribute to coaches in the gym!
It was that ground breaking at the time.
Gymnastics Coaching.com 