http://www.historyking.com/World-War/vietnam-war/50-Facts-On-Vietnam-War.html
http://www.history-timelines.org.uk/events-timelines/06-vietnam-war-timeline.htm
http://news.bbc.co.uk/2/hi/asia-pacific/country_profiles/1243686.stm
http://www.cyberlearning-world.com/nhhs/html3/vet.htm
http://www.history.com/topics/vietnam-war