Não informado. (1919). Scientific Survey of Porto Rico and the Virgin Islands. New York Academy of Sciences.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Scientific Survey of Porto Rico and the Virgin Islands. New York: New York Academy of Sciences, 1919.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Scientific Survey of Porto Rico and the Virgin Islands. New York Academy of Sciences, 1919.
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