Britannica: SEATOSoutheast Asia Treaty Organization (SEATO), regional-defense organization from 1955 to 1977, created by the Southeast Asia Collective Defence Treaty, signed at Manila on Sept. 8, 1954, by the representatives of Australia, France, New Zealand, Pakistan, the Philippines, Thailand, the United Kingdom, and the United States.
Southeast Asia Treaty Organization (SEATO) 2016. Britannica School. Retrieved 4 November 2016, from http://school.eb.com.au/levels/high/article/68907
