@book { EducationalChallengesRegardingMilitaryAction,
    title = "Educational Challenges Regarding Military Action",
    author = "Hubert {Annen} and Wolfgang {Royl}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1136121"
}