Asimov, I. (1989). Frontiers: New discoveries about man and his planet, outer space, and the universe. Plume.
芝加哥风格引文Asimov, Isaac. Frontiers: New Discoveries About Man and His Planet, Outer Space, and the Universe. New York: Plume, 1989.
MLA引文Asimov, Isaac. Frontiers: New Discoveries About Man and His Planet, Outer Space, and the Universe. Plume, 1989.
警告：这些引文格式不一定是100％准确.