{"source":"journal","style":"apa","journal": {"title":"National geographic." },"contributors": [{"function":"author","last":"National Geographic Society (Etats-Unis),"} ],"pubtype": {"main": "pubjournal"},"pubjournal": {"year":"1999"},"datasource":"/z-wcorg/","datasource":"http://www.worldcat.org","oclc":"299632582","issn":"1297-1715"}