@book { CorporateandPrivatePensionPlansintheUnitedStates,
    title = "Corporate and Private Pension Plans in the United States",
    author = "Yildiz {Saglik}",
    year = "2009",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836640084",
    url = "https://m.diplom.de/document/227461"
}