Answer is, "An article found in a scientific anthology."
Why? An article contains 2 important elements to see if you can credit the person who made it: The author and the date. The most obvious one is the author because you can give credit to the person who made the article.
Hope that explanation can help in the future on a source that has credible info. And sorry if I didn't make sense, I am new to this, and I never really tried to help someone like this.