Cita APA (7a ed.)

Posen, M. (2003). Question and Answer Encyclopedia: The natural World. Parragon Publishing.

Cita Chicago Style (17a ed.)

Posen, Michael. Question and Answer Encyclopedia: The Natural World. Bath Bai IHE, Inglaterra: Parragon Publishing, 2003.

Cita MLA (9a ed.)

Posen, Michael. Question and Answer Encyclopedia: The Natural World. Parragon Publishing, 2003.