@book { PapstJohannesXXIIIFriedenslehrePaceminterris1963unddieSituationNigerias,
    title = "Papst Johannes XXIII. Friedenslehre «Pacem in terris» (1963) und die Situation Nigerias",
    author = "Polycarp {Ibekwe}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1108355"
}