Find the original source on the Wikipedia page. For example, take a look at the Wikipedia page for the game Monopoly. (Google "Monopoly Game" and click on the Wikipedia entry). Wikipedia states that the British Secret Service used a special version of Monopoly to sneak information to prisoners of war. The superscript number 5 refers to source number 5 at the bottom of the Wikipedia page. Clicking on this link takes you to a story by ABC News that verifies the story. ABC News, therefore, is the actual source you need to cite.
Cite the source in-text by using the author's name in the text of the paper. For example: Monopoly was used to aid prisoners of war in World War II, (Heussner).
Cite the electronic source in the bibliography by including the author, the title of the article and the website, the publication information, the date you accessed the information and the medium. For example: Heussner, Ki Mae. "Get out of Jail Free: Monopoly's Hidden Maps", abcnews.go.com. ABC News, 18 Sept. 2009. Web. 25 June 2011.