@book { HistoriapolticayeconmicadelPerdelsigloXX,
    title = "Historia política y económica del Perú del siglo XX",
    author = "Alexa {Wissel}",
    year = "2006",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638454063",
    url = "https://www.hausarbeiten.de/document/48814"
}