Can anyone recommend a good book on schooling/dressage?

[Twizzel]

Seeing as we are doing so much schooling at the mo, I thought a good book or 2 might suggest some different exercises to work on rather than circles and serpentines etc, does anybody know which books are particularly good? Nothing too advanced just basic flatwork exercises and tips for rider position etc would be fab

 

[NeedNewHorse]

Ride with your mind by Mary Wanless is brilliant for position (the brilliance one)

And possibly 101 Schooling Exercises may be good for some other things to do with regards to trying out a few more schooling techniques.

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