I have been working on a spanish language version which has been available in AMAZON now for some weeks. My first book on the subject was published in spanish in 2003 by McGraw Hill in a programming series which no longer exists. A new version was published in 2012, also in spanish by ARTUAL, a publishing house in Barcelona which no longer exists either. This has led me to prefer publishing through AMAZON which I hope will be more durable. As to the Kindle versions, I'll devote my time the next months to updating them. There are also spanish versions of them. So it's a lot of work due. Thanks for your interest. I hope the new versions will also be helpful.