Não informado. (1919). Scientific Survey of Porto Rico and the Virgin Islands. New York Academy of Sciences.
Citace podle Chicago (17th ed.)Não informado. Scientific Survey of Porto Rico and the Virgin Islands. New York: New York Academy of Sciences, 1919.
Citace podle MLA (8th ed.)Não informado. Scientific Survey of Porto Rico and the Virgin Islands. New York Academy of Sciences, 1919.
Upozornění: Tyto citace jsou generovány automaticky. Nemusí být zcela správně podle citačních pravidel..