Não informado. Puerto Rico Journal of Public Health and Tropical Medicine. Department of Health of Puerto Rico.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Puerto Rico Journal of Public Health and Tropical Medicine. San Juan: Department of Health of Puerto Rico.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Puerto Rico Journal of Public Health and Tropical Medicine. Department of Health of Puerto Rico.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.