The book http://www.acceder.buenosaires.gov.ar/images/do/6/9/a/69a7570c90d53049882912492986dcfd.pdf gives the legal sources of the streets of Buenos Aires. For the squares I have not found yet such a compendium but I suppose that also the names of the squares (plazas) and small square (plazoletas) are based on “laws”. Currently I am using the website http://mapa2.buenosaires.gov.ar/ as a source but as I said only for the names not for traces. There the source is the “Dirección General de Estadística y Censos - USIG” of the city of Buenos Aires.

So shall I put “Dirección General de Estadística y Censos - USIG” as the source?

regards

ALE!