@book { VomLesetagebuchzumProduktportfolio,
    title = "Vom „Lesetagebuch“ zum „Produktportfolio“",
    author = "Jana {M.}",
    year = "2013",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783656502753",
    url = "https://www.hausarbeiten.de/document/213211"
}