@book { MethodologyfortheNaturalAcquisitionofSecondLanguages,
    title = "Methodology for the Natural Acquisition of Second Languages",
    author = "Javier {Gonzalez Fernandez}",
    year = "2020",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1058759"
}