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