Não informado. (2008). Report of the Commissioner of Health of Porto Rico. Bureau of Insular Affairs.
Chicago-referens (17:e uppl.)Não informado. Report of the Commissioner of Health of Porto Rico. Washington: Bureau of Insular Affairs, 2008.
MLA-referens (8:e uppl.)Não informado. Report of the Commissioner of Health of Porto Rico. Bureau of Insular Affairs, 2008.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.