@book { MarkenbildunginderGastronomie,
    title = "Markenbildung in der Gastronomie",
    author = "Hendrik {Fennel}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832463083",
    url = "https://m.diplom.de/document/221752"
}