@book { KundenbindungimMarkenportfolio,
    title = "Kundenbindung im Markenportfolio",
    author = "Florian {Wecker}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1097855"
}