Não informado. (1941). Agricultura experimental. University of Puerto Rico, Agricultural Experiment Station.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Agricultura Experimental. Rio Piedras, Porto Rico: University of Puerto Rico, Agricultural Experiment Station, 1941.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Agricultura Experimental. University of Puerto Rico, Agricultural Experiment Station, 1941.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.