Jones, C. F., & Pico, R. (1955). Symposium on the geography of Puerto Rico. University of Puerto Rico Press.
Chicago-viite (17. p.)Jones, Clarence Fielden, ja Rafael Pico. Symposium on the Geography of Puerto Rico. Rio Piedras: University of Puerto Rico Press, 1955.
MLA-viite (8. p.)Jones, Clarence Fielden, ja Rafael Pico. Symposium on the Geography of Puerto Rico. University of Puerto Rico Press, 1955.
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