@book { BesonderheitendesMarketingsfrInvestitionsgter,
    title = "Besonderheiten des Marketings für Investitionsgüter",
    author = "Michael {Henghuber}",
    year = "2010",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640697977",
    url = "https://www.hausarbeiten.de/document/155752"
}