@book { ProgrammierungeinesMikrocontrollers,
    title = "Programmierung eines Mikrocontrollers",
    author = "B. Eng. Axel {Jörn}",
    year = "2015",
    publisher = "BACHELOR + MASTER PUBLISHING",
    address = "Hamburg, Deutschland",
    url = "https://m.bachelor-master-publishing.de/document/298203"
}