Citazione APA

National Geographic Society. (2007). Γρίπη των πτηνών: πόσο κινδυνεύουμε. Αθήνα: National Geographic Society.

Stile di citazione Chicago

National Geographic Society. Γρίπη των πτηνών: πόσο κινδυνεύουμε. Αθήνα: National Geographic Society, 2007.

Citazione MLA

National Geographic Society. Γρίπη των πτηνών: πόσο κινδυνεύουμε. Αθήνα: National Geographic Society, 2007.

Attenzione: Queste citazioni potrebbero non essere precise al 100%.