Παραπομπή σε μορφή APA (7η εκδ.)

Não informado. (1919). Scientific Survey of Porto Rico and the Virgin Islands. New York Academy of Sciences.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Não informado. Scientific Survey of Porto Rico and the Virgin Islands. New York: New York Academy of Sciences, 1919.

Παραπομπή σε μορφή MLA (8th εκδ.)

Não informado. Scientific Survey of Porto Rico and the Virgin Islands. New York Academy of Sciences, 1919.

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