Civilization Wiki
Wikipedia has a page called:

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Template documentation (the template shown above may sometimes be hidden or invisible)
This template can be used to provide a handy link to a Wikipedia page related to a Civilization Wiki page.
It takes one argument, which is the name of the Wikipedia page. If omitted, this will default to the name of the page in which it is placed.
Please do not apply this template indiscriminately. It should be used only if a wiki reader would reasonably want to read about the background or source material behind a particular unit, civilization, city, or other aspect of the game (or, for example, to check original and improved syntax, etc, of a template on which it is placed).

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