APA-viite (7. p.)

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

Chicago-viite (17. p.)

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

MLA-viite (9. p.)

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