@book { DasPrinzipLiebe,
    title = "Das Prinzip Liebe",
    author = "Heinrich {Beck}",
    year = "2018",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b13196",
    url = "https://www.peterlang.com/document/1110552"
}