1. บรรณานุกรม
http://www.google.co.th
http://www.facebook.com
http://www.bloggang.com/viewblog.php?id=numpuang&date=27-03-
2009&group=7&gblog=4
http://blog.gootum.com/e-marketing-blog/social-media-optimization-smo
http://mba2010.wikidot.com/5220211059-3g-social-media