Useful links:

http://syrianrefugees.eu/

http://data.unhcr.org/syrianrefugees/regional.php

http://www.theguardian.com/news/datablog/2013/jul/25/syrian-refugee-crisis-in-numbers-updated

https://witness.theguardian.com/assignment/5167c90ce4b06bae4b7cdb93

http://sreo.org/

http://www.brookings.edu

http://pulsemedia.org/2013/12/19/stop-starvation-in-syria-end-the-blockades