@book { Moraldeactitudes,
    title = "«Moral de actitudes»",
    author = "Ulrich {Feger}",
    year = "2013",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-03499-8",
    url = "https://www.peterlang.com/document/1046560"
}