To be honest, I never stopped trusting books over the Internet, and, depending on the topic, older books over newer ones.
After all, before MGC, there was SEO, and before that there were stupid blog authors who wouldn't do proper research.
The only problem with books is that certain fields changed so quickly that they made books obsolete after a very short period of time. Also, editors got progressively worse at their job, to the point that I'm beginning to suspect they may no longer exist.
Related to that, yesterday I went to buy a Chinese dictionary and the clerk convinced me not to, because “you can get all this on the Internet.” Had the dictionary been for myself, I would have bought it.