@book { MglichkeitenundGrenzendeskotourismusinCostaRica,
    title = "Möglichkeiten und Grenzen des Ökotourismus in Costa Rica",
    author = "Anke {Labunski}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832453756",
    url = "https://m.diplom.de/document/220937"
}