Cita APA (7th ed.)

Nardo, D. (2004). Comets and asteroids. Lucent Books.

Cita Chicago (17th ed.)

Nardo, Don. Comets and Asteroids. San Diego, Calif: Lucent Books, 2004.

Cita MLA (9th ed.)

Nardo, Don. Comets and Asteroids. Lucent Books, 2004.