Verschuur, G. L. (1996). Impact!: The threat of comets and asteroids. Oxford University Press.
芝加哥风格引文Verschuur, Gerrit L. Impact!: The Threat of Comets and Asteroids. New York: Oxford University Press, 1996.
MLA引文Verschuur, Gerrit L. Impact!: The Threat of Comets and Asteroids. Oxford University Press, 1996.
警告：这些引文格式不一定是100％准确.