@book { ErflltesLebenAnGebotundVerwirklichung,
    title = "Erfülltes Leben – AnGebot und Verwirklichung",
    author = "Gerhard {Loettel}",
    year = "2013",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-03208-6",
    url = "https://www.peterlang.com/document/1044610"
}