@book { TELEARBEITundMANAGEMENTBYOBJECTIVES,
    title = "TELEARBEIT und MANAGEMENT BY OBJECTIVES",
    author = "Christian {Hager}",
    year = "2002",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832451202",
    url = "https://m.diplom.de/document/220647"
}