Não informado. (2007). Report of the director. University of Puerto Rico, School of Tropical Medicine.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Report of the Director. San Juan: University of Puerto Rico, School of Tropical Medicine, 2007.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Report of the Director. University of Puerto Rico, School of Tropical Medicine, 2007.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.