National Geographic Society. (2000). Plants. New York: McGraw-Hill School Division.
Stile di citazione ChicagoNational Geographic Society. Plants. New York: McGraw-Hill School Division, 2000.
Citazione MLANational Geographic Society. Plants. New York: McGraw-Hill School Division, 2000.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.