@book { VomFuballerzumTestimonialLeistungskriterienvonBundesligaTestimonials,
    title = "Vom Fußballer zum Testimonial: Leistungskriterien von Bundesliga-Testimonials",
    author = "David {Kittelmann}",
    year = "2015",
    publisher = "BACHELOR + MASTER PUBLISHING",
    address = "Hamburg, Deutschland",
    url = "https://m.bachelor-master-publishing.de/document/297964"
}