@book { OlderWorkersinaSustainableSociety,
    title = "Older Workers in a Sustainable Society",
    author = "Richard {Ennals} and Robert H. {Salomon}",
    year = "2012",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-01004-6",
    url = "https://www.peterlang.com/document/1045647"
}