Não informado. Puerto Rico Journal of Public Health and Tropical Medicine. Department of Health of Puerto Rico.
Chicago-referens (17:e uppl.)Não informado. Puerto Rico Journal of Public Health and Tropical Medicine. San Juan: Department of Health of Puerto Rico.
MLA-referens (8:e uppl.)Não informado. Puerto Rico Journal of Public Health and Tropical Medicine. Department of Health of Puerto Rico.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.