Não informado. (1917). Journal of the Department of Agriculture. University of Puerto Rico.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Journal of the Department of Agriculture. Rio Piedras, Porto Rico: University of Puerto Rico, 1917.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Journal of the Department of Agriculture. University of Puerto Rico, 1917.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.