Groovy in Action
Dierk Koenig, Andrew Glover, Paul King, Guillaume Laforge, Jon SkeetISBN: 1932394842;
--Alexander Popescu, Mindstorm "Groovy in Action is not just a language guide, but represents the clear, readable and enjoyable specification of Groovy (and you should definitely read it and start playing with Groovy." --Andrew Binstock, SD Times "The definitive book on the [Groovy] language."
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