SEO 2014 Book [Suggestion]

Hey BHW members,

I've been struggling around with SEO overall and what's still working and what not. So I would love if you can suggest me any SEO books, that are still viable(2014). It doesn't matter if they are for beginners or not. Thank you in advance!

you should use the search bar on the top left of this forum or backlinko.com is a very good start also Quicksprout.com...