Tài liệu tham khảo WikiPedia: Serrana,_São_Paulo http://www.ibge.gov.br/home/estatistica/populacao/... http://www.serrana.sp.gov.br http://WikiMapia.org/#lat=-21.2075387&lon=-47.6077... http://tools.wmflabs.org/geohack/geohack.php?langu...