APA (7e ed.) Bronvermelding

Verschuur, G. L. (1996). Impact!: The threat of comets and asteroids. Oxford University Press.

Chicago (17e ed.) Bronvermelding

Verschuur, Gerrit L. Impact!: The Threat of Comets and Asteroids. New York: Oxford University Press, 1996.

MLA (9e ed.) Bronvermelding

Verschuur, Gerrit L. Impact!: The Threat of Comets and Asteroids. Oxford University Press, 1996.