2015.07.30~2015.08.13
參考連結
http://blog.humblebundle.com/post/125942832312/the-humble-music-books-bundle-with-a-little-help
http://blog.humblebundle.com/post/125358925595/the-humble-music-books-bundle-with-a-little-help
http://us7.campaign-archive1.com/?u=a42731fd3353ff4c76f7f11bb&id=ac9199522f
http://us7.campaign-archive2.com/?u=a42731fd3353ff4c76f7f11bb&id=324f7b1b08