@book { MarySlessorPioniermissionarinunterKannibalen,
    title = "Mary Slessor: Pioniermissionarin unter Kannibalen",
    author = "An {Bueltmann} and V. {Heptin} and A. {Heptin}",
    year = "2024",
    publisher = "Classic Biography",
    address = ", Deutschland",
    url = "https://tolino.openpublishing.com/document/1449485"
}