Groovy Dsl's, which book to follow?

Which Book is best for learning Gro开发者_开发百科ovy DSL's? I came across this book : Groovy For DSL's . Apart from this book are there any other books, blogs,site tutorials for learning DSL's using Groovy from scratch?

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I didn't find any other book on the subject. I'm waiting for the second edition of Groovy in Action, but it seems DSL part is light

Not related to Groovy but Domain-Specific Languages by Martin Fowler is quite a good book for explaing scope of dsl, examples and patterns.