APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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