"Malaysia". The World Factbook. Central Intelligence Agency. 28 September 2016. Archived from the original on 15 October 2021. Retrieved 24 January 2021.
"Thailand". The World Factbook. Central Intelligence Agency. 28 September 2016. Archived from the original on 10 June 2021. Retrieved 24 January 2021.
"Myanmar". The World Factbook. Central Intelligence Agency. 28 September 2016. Archived from the original on 1 December 2021. Retrieved 24 January 2021.
"Cambodia". The World Factbook. Central Intelligence Agency. 28 September 2016. Archived from the original on 10 June 2021. Retrieved 24 January 2021.
"Vietnam". The World Factbook. Central Intelligence Agency. 28 September 2016. Archived from the original on 10 June 2021. Retrieved 24 January 2021.
"Malaysia". The World Factbook. Central Intelligence Agency. 28 September 2016. Archived from the original on 15 October 2021. Retrieved 24 January 2021.
"Thailand". The World Factbook. Central Intelligence Agency. 28 September 2016. Archived from the original on 10 June 2021. Retrieved 24 January 2021.
"Myanmar". The World Factbook. Central Intelligence Agency. 28 September 2016. Archived from the original on 1 December 2021. Retrieved 24 January 2021.
"Cambodia". The World Factbook. Central Intelligence Agency. 28 September 2016. Archived from the original on 10 June 2021. Retrieved 24 January 2021.
"Vietnam". The World Factbook. Central Intelligence Agency. 28 September 2016. Archived from the original on 10 June 2021. Retrieved 24 January 2021.