@book { AztekenundSpanier,
    title = "Azteken und Spanier",
    author = "Peter {Sandmaier}",
    year = "2010",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640604869",
    url = "https://www.hausarbeiten.de/document/149733"
}