@book { UnderstandingAdvocacyLoyaltyandCommittmentLoyaltyACashCowbydefinition,
    title = "Understanding Advocacy, Loyalty and Committment. Loyalty -  A 'Cash Cow' by definition?",
    author = "Judith {Hoffmann}",
    year = "2006",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638469623",
    url = "https://www.hausarbeiten.de/document/50837"
}