@book { bungsbuchBeschaffungProduktionundLogistik,
    title = "Übungsbuch Beschaffung, Produktion und Logistik",
    author = "Hans-Ulrich {Küpper} and Christian {Hofmann} and Michael {Gutiérrez}",
    year = "2015",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1220905"
}