@book { ZurEffizienzderSelbsthilfeorganisation,
    title = "Zur Effizienz der Selbsthilfeorganisation",
    author = "Rino {Sa danoer}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1086704"
}