@book { LandlosenbewegunginBrasilien,
    title = "Landlosenbewegung in Brasilien",
    author = "Michael {Steinfelder}",
    year = "2001",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832431082",
    url = "https://m.diplom.de/document/218815"
}