@book { ZurSacheSachunterricht,
    title = "Zur Sache Sachunterricht",
    author = "Michael {Soostmeyer} and Michael {Soostmeyer}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1087714"
}