I've always loved reading books and when it comes to hair care, trust me there are a TON of books to be read! I'm still getting round to reading them all but for now these are the ones that caught my eye and which I've read and thoroughly enjoyed.
First of is what I consider my 'hair bible' for the great in depth information on the science of hair and understanding how hair ( afro textured) works. It is quite informative and can be quite 'scientific' in the terms used but if you're really interested in understanding the composition of our hair, the different types of ingredients in products, their interactions with one another and how they affect the hair; then trust me, 'The Science of Black Hair' is an invaluable book which you will refer to over and over again.