MediaWiki:Growthexperiments-help-panel-suggestededits-tips-vector-visualeditor-references-main-step2

Next, can look for sources through search engines, news sites, or  library. $1  $2  $3  $4 Follow these guidelines when adding a reference:
 * Reliable sources include books, news organisations, and magazine articles.
 * Social media or blogs are usually not reliable sources.
 * Information published by the subject, such as a company's own website, is usually not reliable.