(en) « Encyclopedia.com | Free Online Encyclopedia » [archive du ], encyclopedia.com : « Featured publications from Gale on the homepage: "International Encyclopedia of the Social Sciences"; "Cities of the World"; "Encyclopedia of American Foreign Policy"... ».
(en) « Encyclopedia.com | Free Online Encyclopedia » [archive du ], encyclopedia.com : « Featured publications from Gale on the homepage: "International Encyclopedia of the Social Sciences"; "Cities of the World"; "Encyclopedia of American Foreign Policy"... ».