@book { BusinessModelGenerationErstellungeinesBusinessplan,
    title = "Business Model Generation, Erstellung eines Businessplan",
    author = "Anna Lena {Bischoff}",
    year = "2014",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    url = "https://www.hausarbeiten.de/document/279647"
}