Great Book Series to Learn Korean

Korean from Zero Series here: http://amzn.to/1Z6L28q 
Korean made Simple Series here: http://amzn.to/1XYp3Sy

Free audio is available for both courses:

Audio for Korean Made Simple: http://gobillykorean.com/download-the-audio-content-for.../

Audio for Korean from Zero: http://www.koreanfromzero.com