Retrieved 2010-05-10. • (in German). Retrieved 2011-06-17.

The reggae artist with the greatest impact in history, who introduced Jamaican music to the world and changed the face of global pop music.

• (in German). Retrieved 2011-06-17. Retrieved 2011-06-17. Retrieved 2011-06-17. Archived from on 2012-10-13. Retrieved 2011-06-17.

• (in Dutch). Retrieved 2011-06-17. Retrieved 2011-06-18. Retrieved 2010-05-10. Retrieved 2010-05-10.

Retrieved 2010-05-10. Retrieved 2010-05-10.

Retrieved 2010-05-10. Retrieved 2010-05-10. Retrieved 2010-05-10. Retrieved 2010-05-10. Retrieved 2010-05-10.

Retrieved 9 July 2014. Retrieved 2010-05-10.

PECS provides an immediately useful method for requesting things, actions and people, in a way that requires and promotes social interaction. Individuals who are nonverbal or have limited speech need a communication system they can start using right now. It’s well-known because it’s an evidence-based practice and when implemented with fidelity, it works! If you work in special education or have a child with a diagnosis you’ve probably heard of the Picture Exchange Communication System (PECS).

Retrieved 2010-05-10. Retrieved 2010-05-10. Retrieved 2010-05-10. Retrieved 2010-05-10. Retrieved 2010-05-10.

Archived from on 2007-03-25. Retrieved 2011-06-17. Archived from on 2011-11-20.

Retrieved 2016-07-28. Retrieved 2016-07-28.

Retrieved 2016-07-28.