I came to say the same thing. I can't believe the article didn't trace the practice back to Campbell's book, especially after mentioning Star Wars (which Lucas

I came to say the same thing. I can't believe the article didn't trace the practice back to Campbell's book, especially after mentioning Star Wars (which Lucas pretty explicitly based on the formula in the book). To be fair, Campbell was writing about archetypical stories in human societies, not how to make a movie. Lucas correctly saw that they were one and the same.