Encylopedia... Encyclopedia of science & technology: Sor-sup. Volume XVII. Mc Graw Hill.
Lua i Stíl Chicago (17ú heag.)Encylopedia... Encyclopedia of Science & Technology: Sor-sup. Volume XVII. Mc Graw Hill.
Lua MLA (8ú heag.)Encylopedia... Encyclopedia of Science & Technology: Sor-sup. Volume XVII. Mc Graw Hill.
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