@book{Lourenco:LatinZero,
  title     = "Latin do Zero",
  author    = "Frederico Lourenço",
  address   = "Lisboa",
  edition   = "1",
  publisher = "Quetzal",
  year      = "2020",
}
@book{Lourenco:NGL,
  title     = "Nova Gramática de Latim",
  author    = "Frederico Lourenço",
  address   = "Lisboa",
  edition   = "1",
  publisher = "Quetzal",
  year      = "2019",
}