In general, printing a Wikipedia article is as simple as selecting Printable version from the MediaWiki sidebar. Your browser probably has its own print preview feature.
|This page in a nutshell: To print a Wikipedia page, select File → Print from your web browser, or click on the browser print icon.|
The MediaWiki software that Wikipedia runs on uses Cascading Style Sheets in order to specify the style and layout that is suitable to a printed version of the page. In modern browsers, the print function of the browser should automatically use the rules in the style sheets when you print an article, therefore the print command of your web browser is also useful.
Certain page elements normally do not print; these include self references like section edit links, navigation boxes, message boxes and metadata.