@book { HerleitungdesFlcheninhaltseinesParallelogrammsMathematik7KlasseGymnasium,
    title = "Herleitung des Flächeninhalts eines Parallelogramms (Mathematik 7. Klasse, Gymnasium)",
    author = "Jennifer {Jollet}",
    year = "2016",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    url = "https://www.hausarbeiten.de/document/345297"
}