Books are more reliable than the Internet as few people can get published. By going through all the processes to get published, obviously the information will be accurate and not just written in a hurry. Online, anyway can post what they want and is not always reliable. Just this morning I read on Tumblr a post about 5 Fridays, Saturdays, and Sundays in July and after checking, it does not exist. The Internet allows anyone to create information and "facts" but books are more reliable as it is a longer process that verifies accuracy.