@book { DasnenneicheinhaltbaresBndnis,
    title = "«Das nenne ich ein haltbares Bündnis!»",
    author = " {Dr. Ludger Heid}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1100420"
}