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Naumann, E. (1919) Some aspects of the ecology of the limnoplankton, with special reference to the phytoplankton. [Translation from: Svensk Botanisk Tidskrift 13(2) 129-163, 1919.]. Windermere, UK, Freshwater Biological Association, (FBA Translations (New Series), 49)
Vaughn, Thomas Wayland (1919) Contributions to the Geology and Paleontology of the Canal Zone, Panama, and geologically related areas in central America and the West Indies. Part 11: The biologic character and geologic correlations of the sedimentary formations of Panama in their relation to the geologic history of Central America and the West Indies. Bulletin United States National Museum, 103, pp. 547-612.