@book { GesundheitsmanagementinderPraxisMarktanalyseundMarketingplanfreinFitnessstudioinBerlin,
    title = "Gesundheitsmanagement in der Praxis. Marktanalyse und Marketingplan für ein Fitnessstudio in Berlin",
    author = "Maria {Stahl}",
    year = "2016",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    url = "https://www.hausarbeiten.de/document/350764"
}