@book { Worklifebalanceamongcruiseshipcrews,
    title = "Work-life balance among cruise ship crews",
    subtitle = "A quantitative research approach",
    author = "C. {Schädel}",
    year = "2011",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783842809314",
    url = "https://m.diplom.de/document/228252"
}