@book { SchneSeeleroterDrache,
    title = "«Schöne Seele, roter Drache»",
    author = "Heidi {Beutin} and Wolfgang {Beutin}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1104908"
}