@book { AllahalleinistGott,
    title = "Allah allein ist Gott",
    subtitle = "Über die Herausforderung der christlichen Welt durch den Islam",
    author = "Rosemarie {Wirsching}",
    year = "2002",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1093979"
}