What's the best flex 4 book? [closed]

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I have already the Adobe Flex 3 bible and would up to speed with Flex 4 and learn the new stuff. Which of these books should I buy?

Developing Flex 4 Components

Effortless Flex 4 Development

Flex 4 Fun

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If I had to pick from that list, I'd go with Developing Flex 4 Components.

You may also want to consider Enterprise Development with Flex: Best Practices for RIA Developers (Adobe Dev Lib).