Here is the rules/guidlines/style in which wikipedia require authors to post their infomration.
http://en.wikipedia.org/wiki/Wikipedia:Manual_of_Style
The Manual of Style, often abbreviated MoS, is a style guide for Wikipedia articles. This article contains basic principles. The menu to the right contains links to Manual of Style articles that explore topics in detail. Another way to access the Manual of Style is through Wikipedia:Editor’s index to Wikipedia. Finally, you can search the Wikipedia namespace by typing “wp:” followed by your search term in the “search” box to the left of this screen.
If the Manual of Style does not specify a preferred usage, discuss your issues on the talk page of this article.