Cita APA (7th ed.)

Steel, D. (1995). Rogue asteroids and doomsday comets: The search for the million megaton menace that threatens life on earth. Wiley.

Cita Chicago (17th ed.)

Steel, Duncan. Rogue Asteroids and Doomsday Comets: The Search for the Million Megaton Menace That Threatens Life on Earth. New York: Wiley, 1995.

Cita MLA (9th ed.)

Steel, Duncan. Rogue Asteroids and Doomsday Comets: The Search for the Million Megaton Menace That Threatens Life on Earth. Wiley, 1995.