Não informado. (2007). Report of the director. University of Puerto Rico, School of Tropical Medicine.
Chicago-referens (17:e uppl.)Não informado. Report of the Director. San Juan: University of Puerto Rico, School of Tropical Medicine, 2007.
MLA-referens (8:e uppl.)Não informado. Report of the Director. University of Puerto Rico, School of Tropical Medicine, 2007.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.