How do you do an internal citation MLA style?

I'm doing a paper for my U.S. History cl and I wanted to know how to do an internal citation when you use a website. So the website is say Wikipedia and there is only one page so would it be, "Sentence blahh blahh blahh (Wikipedia 1)"? I know how to do it with books just not internet. And remember, it has to be MLA format and an internal citation not in like a bibliography on a seperate page.