Patricks+Bibliography

http://en.wikipedia.org/wiki/Tibet#cite_ref-44

http://www.thdl.org/collections/history/timeline_general.html

http://en.wikipedia.org/wiki/Qinghai-Tibet_Railway

http://edition.cnn.com/2008/WORLD/asiapcf/03/14/tibet.timeline/index.html

http://www.asianews.it/index.php?art=4023&l=en