http://www.history.com/this-day-in-history/my-lai-massacre-takes-place-in-vietnam
http://www.gilderlehrman.org/history-by-era/sixties/essays/vietnam-war-and-my-lai-massacre
http://www.pbs.org/frontlineworld/stories/cambodia/tl02.html
http://dept.kent.edu/sociology/lewis/lewihen.htm
http://chnm.gmu.edu/hardhats/cambodia.html
https://sites.google.com/site/bblockushistorymylaimassacre/impact-on-vietnam-war
http://www.history.com/this-day-in-history/u-s-south-vietnamese-forces-launch-cambodian-incursion
http://www.history.com/this-day-in-history/cooper-church-amendment-passes-in-senate
http://www.gilderlehrman.org/history-by-era/sixties/essays/vietnam-war-and-my-lai-massacre
http://www.pbs.org/frontlineworld/stories/cambodia/tl02.html
http://dept.kent.edu/sociology/lewis/lewihen.htm
http://chnm.gmu.edu/hardhats/cambodia.html
https://sites.google.com/site/bblockushistorymylaimassacre/impact-on-vietnam-war
http://www.history.com/this-day-in-history/u-s-south-vietnamese-forces-launch-cambodian-incursion
http://www.history.com/this-day-in-history/cooper-church-amendment-passes-in-senate