@book { MobbinginderSchuleUrsacheAuswirkungundPrvention,
    title = "Mobbing in der Schule: Ursache, Auswirkung und Prävention",
    author = "Dr. Stephanie {Sasse}",
    year = "2015",
    publisher = "BACHELOR + MASTER PUBLISHING",
    address = "Hamburg, Deutschland",
    url = "https://m.bachelor-master-publishing.de/document/297842"
}