 The use of the Green Book as a false document has roots in the Gothic tradition and is similar to the use of such documents by Bram Stoker in "Dracula" and to H. P. Lovecraft's use of the "Necronomicon" and Wilbur Whateley's diary in "The Dunwich Horror".Some of the strange words and names in the Green Book are actual occult terms, but most were invented by Machen for the story.Of these, some would be picked up by later authors of weird fiction—notably "Aklo", which was used by Lovecraft in connection with the "Sabaoth" invocation in "The Dunwich Horror".