@book { SpartippsfrFamilienDasultimativeHandbuchfrfamilienorientiertesSparen,
    title = "Spartipps für Familien - Das ultimative Handbuch für familienorientiertes Sparen",
    author = "Sven {Ihrke}",
    year = "2023",
    publisher = "via tolino media",
    address = "München, Deutschland",
    url = "https://tolino.openpublishing.com/document/1379662"
}