@book { MxicoylosEstadosUnidosGuerrayMigracin,
    title = "México y los Estados Unidos: Guerra y Migración",
    author = "Jens {Hahn}",
    year = "2009",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640351497",
    url = "https://www.hausarbeiten.de/document/127979"
}