Heiser, V. G. (2011). Newcomers to the tropics. Bulletin of the American Historical Collection.
Chicago-viite (17. p.)Heiser, Victor G. "Newcomers to the Tropics." Bulletin of the American Historical Collection 2011.
MLA-viite (9. p.)Heiser, Victor G. "Newcomers to the Tropics." Bulletin of the American Historical Collection, 2011.
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