Publishers have reputations for integrity in producing materials that are useful and trustworthy. While not every book in a library or every article in a journal is always absolutely trustworthy, you can at least be sure that unbiased minds have checked on the information source before making it available. No such assurance lies behind information on the Net. This can be a good thing. Censorship is very difficult.
Information disseminates freely and quickly.
Try to find a traditional print resource that backs up information you find on the net. This is particularly important if the information contradicts what you've found in other places. These are the kinds of critical questions you should always ask of any information source. They are particularly important when dealing with material taken from the Internet. Things tend to disappear with no warning on the net.