@book { StrategischeMarketingplanunginWarenhusern,
    title = "Strategische Marketingplanung in Warenhäusern",
    author = "Friedrich {Wehrle}",
    year = "2018",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b13645",
    url = "https://www.peterlang.com/document/1068238"
}