Não informado. Puerto Rico Health Bulletin. Insular Department of Health.
Chicago-Zitierstil (17. Ausg.)Não informado. Puerto Rico Health Bulletin. San Juan: Insular Department of Health.
MLA-Zitierstil (8. Ausg.)Não informado. Puerto Rico Health Bulletin. Insular Department of Health.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.