Best Introductory Book On In Hand Work?

[abi king]

Any suggestions? I've never done any, but am very interested, so need the numpty guide.

[Camacoona]

Schooling Horses Inhand (for suppleness and collection) My Richard Hinrich is an excellent book.  Alfonz J Dientz has a book out In Hand Work, the Iberian Method, is also good, but the translation is not as easy to read as the Hinrich book.