How do you get Ivory in Civilization IV?

How do you get Ivory in Civ IV, like I want to invade the Portuguese, but I need War Elephant!How do you get Ivory in Civilization IV?
Find the resource which will look like elephants, build a camp there, and hook it up to your cities with trade routes.How do you get Ivory in Civilization IV?
Find an elephant resource (on the map of course), eventually trade with allies.