@book { MarktbeeinflussungdurchTourismus20,
    title = "Marktbeeinflussung durch Tourismus 2.0",
    author = "Tim {Lellinger}",
    year = "2010",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783842806900",
    url = "https://m.diplom.de/document/228151"
}