Please answer the following question: Worldwar: In the Balance - Worldwar: In the Balance is an alternate history and science fiction novel by Harry Turtledove. It is the first novel of the Worldwar tetralogy as well as the first installment in the extended Worldwar series that includes the Colonization trilogy and the novel Homeward Bound. The plot begins in late 1941 while the Earth is torn apart by World War II. An alien fleet arrive to conquer the planet forcing the warring nations to make uneasy alliances against the invaders. Given a choice of categories company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, the text refers to which one?
A:
Written Work