http://definicion.de/marketing/

http://www.marketing-xxi.com/etapas-del-plan-de-marketing-136.htm

http://www.tribalcafe.co.uk/marketing-3-0-communities-crowds-and-collectives/

http://raulmolivera.blogspot.com/2011/04/los-credos-del-marketing-30.html

https://marketingasaz.wordpress.com/2013/10/04/marketing-vs-marketing/