Não informado. (2000). Technical paper. University of Puerto Rico, Agricultural Experiment Station.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Technical Paper. Rio Piedras, Porto Rico: University of Puerto Rico, Agricultural Experiment Station, 2000.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Technical Paper. University of Puerto Rico, Agricultural Experiment Station, 2000.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.