Also, regardless of what the salesperson tells you at the time of purchase a book will always have the right information, so why not pick one up?
That part isn't exactly... correct. Or even close to it.
Encouraging your customers to read is always a positive thing... thinking that just because something was published, it's automatically right is NOT. There are literally hundreds of absolutely horrible and wrong books which have been written, published and sold- many of these are still in print. Telling someone to trust a single informational source as being infalliable is frankly kinda stupid. Suggest informational resources that you agree with but don't take it too far.
"Genes, Like Leibnitz's monads, have no windows; the higher properties of life are emergent... And once assembled, organisms have no windows." - Edward Wilson, Sociobiology