"United States ," in The New International Encyclopædia , New York: Dodd, Mead and Co. (1905)
"United States ," in The Nuttall Encyclopædia , (ed.) by James Wood , London: Frederick Warne and Co., Ltd. (1907)
"United States, The ," in Encyclopædia Britannica (11th ed., 1911)
"United States of America ," in Catholic Encyclopedia , (ed.) by Charles G. Herbermann and others, New York: The Encyclopaedia Press (1913)
"United States of America, The ," in The New Student's Reference Work , Chicago: F.E. Compton and Co. (1914)
"United States of America ," in Collier's New Encyclopedia , New York: P. F. Collier & Son Co. (1921)
"United States ," in The World Factbook , (ed.) by CIA (1982)
"United States ," in The World Factbook , (ed.) by CIA (1990)
"United States ," in CIA World Fact Book , (ed.) by CIA (2004)
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