  :Encyclopaedias are not generally reliable sources - they're 3rd party references just like we are.  And which encyclopedia is it you think you are referencing?   The only details given are to a website with no provenance listed.  If you are referencing a reputable encyclopaedia, you need to at least make sure you provide appropriate details on it (version, volume, page number etc., linking to a no-provenance website is not the same thing) - though the way in which the links have been added would be hard to justify if regardless of the source.    