While writing an essay, I discovered that my MacBook Ru-En dictionary suggests using amount speaking about books:
So, that is what I have in my text:
I state again that reading a lot has big advantages: while reading we develop our imagination and vocabulary and it is strongly connected with the amount of books.
On the other hand, there is an ambiguous information given on another site.
Could you please explain: is it correct to use the word amount in relation to books?