@book { SocialSoftwareimMarketing,
    title = "Social Software im Marketing",
    author = "Torsten {Liebig}",
    year = "2006",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832497583",
    url = "https://m.diplom.de/document/224832"
}