@book { PUMADererfolgreicheWandelzurLifeStyleMarke,
    title = "PUMA: Der erfolgreiche Wandel zur Life-Style-Marke",
    author = "Sebastian {Selzer}",
    year = "2015",
    publisher = "BACHELOR + MASTER PUBLISHING",
    address = "Hamburg, Deutschland",
    url = "https://m.bachelor-master-publishing.de/document/297742"
}