@book { DerJenaplanPeterPetersens,
    title = "Der Jenaplan Peter Petersens",
    author = "Friedrich August {Funke}",
    year = "2011",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640866724",
    url = "https://www.hausarbeiten.de/document/168742"
}