Calm Your Inner Geek!
People might talk to you about Referencing, or Citations. It all sounds a bit obscure, doesn't it?
It's not hard, really. You need to keep note of what you've read, if you are going to 'reference' or 'cite' it later. (You might also to keep a list of things you mean to read later, so you don't lose track of those interesting titles...)
There are various apps out there. RefMe is the new kid on the block, but it's quite easy to use and seems to do the job, so you may like to take a look at it.
Anything that saves you racking your brains or rifling through notepads later, has to be a good thing, right?
We'll tell you about some other resources another day!