@book { EigenversusFremdbezug,
    title = "Eigen- versus Fremdbezug",
    author = "Tobias {Viecenz}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832436346",
    url = "https://m.diplom.de/document/219286"
}