While sources in bibliographies must typically have the source's author and published date listed, this information is usually not required if it's not available. wiseGEEK, like other websites, does not provide the date its articles were originally published. Relevant data, including the author's name, for citing a wiseGEEK page may be found in the "Article Details" section in the left hand column. Here's one way of citing a wiseGEEK article in a bibliography:
Author's Last Name, First Name (if any). "Article Title" wiseGEEK. Date you accesed the page. <URL of article>.
Again, that's only one way to cite our articles. You should check with your teacher or instructor for a definitive answer before turning in your report or project! Good Luck!