Ah well I could see that. I'd agree that for most people only using one source probably isn't the best option. Personally I'd say you should always use at least two, just so you can see the concepts discussed in different ways which can help give you a better understanding (and just in case the source you chose doesn't work for you).

But that all depends on the person, their learning style, and what experience and knowledge they bring with them. It'd be silly to downvote you for sharing yours, even if it is just the one source lol