@book { SuizidimAlter,
    title = "Suizid im Alter",
    author = "Claudia {Mueller}",
    year = "2011",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640994380",
    url = "https://www.hausarbeiten.de/document/177696"
}