The author has the courage of leaving out the mondane parts of the language and not providing a complete reference. This allows him to focus on those parts of the language where you scratch your head and wonder whether you consider the concepts ingenious or insane. This book assists you in making your mind up. While the good parts make up most chapters of the book, the bad parts are pushed back into the appendix.
I purchased the e-book edition directly from O’Reilly Media. They provide e-books in various file formats – all DRM-free.