ハドレー・キャントリル
↑ Investigation of un-American propaganda activities in the United States, United States Government Printing Office, (1940), pp. 3244, "and a special consultant for the Office of the Coordinator of Inter- American Affairs"
↑ Public opinion and polling around the world: a historical encyclopedia, Volume 1 By John Gray Geer, pg 389-390
↑ Public opinion and polling around the world: a historical encyclopedia, Volume 1 By John Gray Geer, pg 388
↑ Stuart Oskamp, P.