Don't worry about formatting references; just get all the information in there. Add page numbers for references from books and magazines. A web address isn't enough since web pages move.
I ran into problems creating references for my first edits here in 2012. I've programmed computers ever since I punched my first IBM card, and used markup languages since RUNOFF, but writing references for Wikipedia introduces one to an entirely different level of complexity. I have been exploring it ever since.
I recommend for your first references (sources):
<ref>Author, Title, Web address if there is one, Publisher, Date, Pages</ref>.
With Visual Editor use Cite->Manual->Basic form, and the editor will add the <ref></ref> part for you.