@book { PsychodiagnostikinTheorieundPraxis,
    title = "Psychodiagnostik in Theorie und Praxis",
    author = "Ernst G. {Wehner}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1071873"
}