The reference book
Technique Development in Tennis Stroke Production, B. Elliott, M . Reid, M. Crespo
Describes each stroke including the biomechanical features. Has a developmental breakdown for children who lack strength for certain components as they develop. Discusses what they are able to do for each stroke as they develop.
The book is available for sale from the ITF, at about $25. It's the best reference on stroke technique that I've seen.
Last edited by Chas Tennis; 11-13-2012 at 05:02 PM.