Vortex Sound Research

Hey guys. Looking for recommendations on any books that can give me a good knowledge of the fundamentals of using synthesizers, ie oscillators, envelopes, filters etc.

I've always just played around with settings until I've found the sound I like, but I'd really like to know what it is that I'm doing and have a better understanding so I can build better patches without all the guesswork. I've watched a bunch of YouTube videos but I'm a better textbook learner. Thanks