APA-ийн эшлэл(7 дахь хэвлэлт)

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

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

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

MLA -ийн эшлэл (9 дэх хэвлэлт)

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