@book { VergangenheitundZukunft,
    title = "Vergangenheit und Zukunft",
    subtitle = "Eine Gemeindewachstumsstudie des Westdeutschen Verbandes der Siebenten-Tags Adventisten von 1945-1990",
    author = "Edgar {Machel}",
    year = "2002",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1093711"
}