Velikvsky, I. (1950). World in collision. Doubleday.
Lua i Stíl Chicago (17ú heag.)Velikvsky, Immanuel. World in Collision. New York: Doubleday, 1950.
Lua MLA (9ú heag.)Velikvsky, Immanuel. World in Collision. Doubleday, 1950.
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