¡Ojo con los Falsos Amigos!: Dicionário de Falsos Cognatos em Espanhol Cód. do Produto: 36355
SUELY FERNANDES BECHARA WALTER GUSTAVO MOURE
This is a very interesting book that surely you can find in Argentina. If not, try Brazil. I bought a copy from a bookstore in Porto Alegre.
Speaking of "false friends", lose the name "Pau" if you're going to be around Brazilians.