You say nothing wrong. Granted, the book is more reliable, but on the other hand, if you look up some information about the update can be seen that in the Internet, everything is much more advanced than in the book. For example, you will find information about the law in Thailand, but the library is a book published in 1980 but set. He called the information outdated because the current law does not know how many copies Thailand changed. Thus, the course of the book, it is unreliable as well.
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