@book { DieRolledesCommunityManagersModeratorsimWissensmanagement,
    title = "Die Rolle des Community Managers/Moderators im Wissensmanagement",
    author = "Silke {Retzer}",
    year = "2003",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638194327",
    url = "https://www.hausarbeiten.de/document/13908"
}