@book { UnterwegsmitundfrDeutsch,
    title = "Unterwegs mit und für Deutsch",
    author = "William {Wagaba} and Steven {Heimlich}",
    year = "2020",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b16382",
    url = "https://www.peterlang.com/document/1058225"
}