@book { DasBilddesMenschenimWerkOttoFWalters,
    title = "Das Bild des Menschen im Werk Otto F. Walters",
    author = "Marcel Roland {Mattes}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1069561"
}