Lovecraft's main literary sources for "The Dunwich Horror" are the stories of Welsh horror writer Arthur Machen, particularly "The Great God Pan" (mentioned in the text of "The Dunwich Horror") and "The Novel of the Black Seal". Both Machen stories concern individuals whose death throes reveal them to be only half-human in their parentage. According to Robert M. Price, "'The Dunwich Horror' is in every sense an homage to Machen and even a pastiche. There is little in Lovecraft's story that does not come directly out of Machen's fiction."