From the Super Mario Wiki
Now, you may be thinking, "What's up with this? Aren't these Wikipedia Standards?" And, of course, you have the right to think this. But you're wrong. These are our standards. "Why?", you may ask? Because its required. By law. And because it should be there. And its easy. Just do it, or your work, no matter how common the knowledge is, no matter how factual, clean, informative it is-it will be deleted. So, please, cite your sources. Because that's life. And life goes on. And even after I've left, I expect cited sources.