Tips on referencing edit
There are lots of ways to do this, some are simple, some more complex.
Personally, I like using citation templates, and fill in as much as I possibly can; maybe a bit more work, but I think it looks better. You have a <REF> at the start, then a suitable cite tag, then </REF>. An example usage is;
<ref>
{{Citation
| last = Preston
| first = Peter
| title = D. H. Lawrence in the modern world
| last2 = Hoare
| first2 = Peter
| publication-date = 1989
| place = [[Cambridge]], [England]
| publisher = [[Cambridge University Press]]
| page = 125
| isbn = 0-521-37169-4
| url = http://books.google.co.uk/books?id=J5nRoaOwkPMC&printsec=frontcover#PPA125,M1
| accessdate = 2008-05-11
}}
</ref>
For all the possible things to include, see Template:Citation
Of course, you don't have to put everything in, just whatever you can. The above example is a book, but I've included a 'convenience link' to a website that displays it.
Then, at the end of the document (but before any 'category' tags), you need a references section. You just put,
== References ==
{{reflist}}
Hard work? - help is at hand. There are lots of tools that create cite tags automagically. Personally, I use Zotero for the web links, and the cite book generator for books.
I also recommend you look at other articles and copy from them - especially featured articles, which should have good refs.
Hope this help, cheers, ~~~~