@book { InnovativeGeschftsmodellevonSchnppchenPortalenimInternet,
    title = "Innovative Geschäftsmodelle von Schnäppchen-Portalen im Internet",
    author = "Phi Long {Nguyen}",
    year = "2012",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783842834323",
    url = "https://m.diplom.de/document/229258"
}