@book { BilingualerGeschichtsunterrichtiminternationalenFokus,
    title = "Bilingualer Geschichtsunterricht im internationalen Fokus",
    author = "Ulrich {Wannagat}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1136289"
}