Hawking, S., Hawking, L., & Bielecki, J. (2021). Unlocking the universe. Puffin.
芝加哥风格引文Hawking, Stephen, Lucy Hawking, 与 Jan Bielecki. Unlocking the Universe. London: Puffin, 2021.
MLA引文Hawking, Stephen, et al. Unlocking the Universe. Puffin, 2021.
警告：这些引文格式不一定是100％准确.