@book { HerrnhuterinHessen,
    title = "Herrnhuter in Hessen",
    subtitle = "Der Herrnhaag in der Grafschaft Büdingen",
    author = "Matthias {Graf}",
    year = "2006",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1101003"
}