@book { SocialCampaigningwithSocialMediaPRundFundraisingToolfrNGOsundNPOs,
    title = "Social Campaigning with Social Media: PR und Fundraising Tool für NGOs und NPOs",
    author = "Henning {Zippel}",
    year = "2015",
    publisher = "BACHELOR + MASTER PUBLISHING",
    address = "Hamburg, Deutschland",
    url = "https://m.bachelor-master-publishing.de/document/297221"
}