@book { PositivePsychologieDie4SulendesGlcks,
    title = "Positive Psychologie – Die 4 Säulen des Glücks",
    author = "David {Heimbacher}",
    year = "2024",
    publisher = "via tolino media",
    address = "München, Deutschland",
    url = "https://tolino.openpublishing.com/document/1457474"
}