Edward Bernays, "the father of public relations," recounts the origin of the term public relations. This clip comes from the documentary "Century of the Self," part 2 "The Engineering of Consent." It can be freely downloaded from iTunes from this link:

https://itunes.apple.com/us/podcast/must-see-tv/id288482343?mt=2&uo=4

This clip is located in the interval 8:06-8:39.

Obituary of Edward Bernays:

http://www.nytimes.com/books/98/08/16/specials/bernays-obit.html