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The book is available in 3 formats and multiple languages (see other tabs for translations).
The PDF format is the document corresponding to the printed book. It's not suitable for reading on small screens. The EPUB format is the recommended format if your reading devices supports it (most smartphones and many ebook readers do support it). The Mobipocket format is mainly for ebook readers that do not support EPUB (like the Kindle).
Click on the link of the version that you wish to download: