The volume of Heaven: "Poetry Rules" by Wang Changling in China (Tang), "The Essence of Poetry" by Yuan Jing in China (Tang), "A Guidebook for the Four Tones" by Liu Shanjing in China (Sui).
天巻　（唐）王昌齢『詩格』、（唐）元兢『詩髄脳』、（隋）劉善経『四声指帰』。