Não informado. (1934). Journal of Agriculture of the University of Puerto Rico. University of Puerto Rico, Agricultural Experiment Station.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Journal of Agriculture of the University of Puerto Rico. Rio Piedras, Porto Rico: University of Puerto Rico, Agricultural Experiment Station, 1934.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Journal of Agriculture of the University of Puerto Rico. University of Puerto Rico, Agricultural Experiment Station, 1934.
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