Não informado. (1919). Scientific Survey of Porto Rico and the Virgin Islands. New York Academy of Sciences.
Style de citation Chicago (17e éd.)Não informado. Scientific Survey of Porto Rico and the Virgin Islands. New York: New York Academy of Sciences, 1919.
Style de citation MLA (8e éd.)Não informado. Scientific Survey of Porto Rico and the Virgin Islands. New York Academy of Sciences, 1919.
Attention : ces citations peuvent ne pas être correctes à 100%.