http://www.kaizen-news.com/poka-yoke-techniques-that-you-should-know/#_ts=1414098052

http://www.alarmasacusticas.blogspot.mx/2014/10/dispositivos-para-prevenir-errores-poka.html

http://bestinpackaging.com/2014/02/12/the-poka-yoke-packaging-concept/