Getting Backlink from articles Confused

Hi Wariors

I got one question about getting backlink for your site using article like: Hubpages Squidoo, EnzineArticles GoArticles I'am a little confused here, allow me to explain..
I find couple different answers how do you correctly get backlink to your site using articles
They say when you creating backling using article people take this article copy and paste them on they site including your site Url which have your link attached and post them on they website to give they visitor more content when they visit they site, this in return give you backlink from webpage they post article on what this exactly mean ? Is that mean the only way to get backlink to your site from article if visitor copy your site Url from EnzineArticles (example) and paste that Url on they site then you will get backlink if they don't copy your site Url and post to they site then you are not getting backlink OR you still getting backlink to your site from articles regardless if visitor copy your site Url and use on they site. Which one is Correct ? Are you still getting Backlink to your site from articles regardless if visitor copy your site Url and post it to their site ?
Any answer will be Good