That relies on the person the article is about being notable enough to have sources. You won't get sources (let alone reliable ones) for my neighbour Barry. So

That relies on the person the article is about being notable enough to have sources. You won't get sources (let alone reliable ones) for my neighbour Barry. So any article about Barry (or any non notable person) is going to be unsourced... That's one of the issues with articles about non noteworthy people...