@book { BelastungimLehrerberuf,
    title = "Belastung im Lehrerberuf",
    author = "Hannes {Hartmann}",
    year = "2011",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656055174",
    url = "https://m.hausarbeiten.de/document/182011"
}