@book { CauseRelatedMarketing,
    title = "Cause-Related Marketing",
    author = "Jenny {Graff}",
    year = "2003",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832465117",
    url = "https://m.diplom.de/document/221926"
}