@book { GroupDynamicsTheNatureofGroupsaswellasDynamicsofInformalGroupsandDysfunctions,
    title = "Group Dynamics: The Nature of Groups as well as Dynamics of Informal Groups and Dysfunctions",
    author = "Uwe {Bußmann}",
    year = "2014",
    publisher = "Anchor Academic Publishing",
    address = "Hamburg, Germany",
    url = "https://m.anchor-publishing.com/document/287486"
}