Belsay Hall Croquet Club

 

The Oxford Croquet site is entirely dedicated to Association, and has a wealth of coaching tips at How To Play Croquet and is home to the collected coaching literature of John Riches which are heartily recommended.

Probably the best, and most recent, book on coaching and tactics for Association is "Complete Croquet: A Guide to Skills, Tactics and Strategy" by James Hawkins.

There's a lot less material available on coaching for Golf Croquet but Croquet New Zealand have some Golf Croquet coaching tips.  

However, the basic coaching modules for Association Croquet will provide tips on how to play shots correctly.