@book { DerhistorischeSokratesQuellenlageundLehre,
    title = "Der historische Sokrates: Quellenlage und Lehre",
    author = "Agnes {Thiel}",
    year = "2015",
    publisher = "BACHELOR + MASTER PUBLISHING",
    address = "Hamburg, Deutschland",
    url = "https://m.bachelor-master-publishing.de/document/297868"
}