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Lua i Stíl Chicago (17ú heag.)Lafferty, Peter. Macmillan Revised ENCYCLOPEDIA of SCIENCE Matter and Energy 1. Macmillan Reference, 1998.
Lua MLA (8ú heag.)Lafferty, Peter. Macmillan Revised ENCYCLOPEDIA of SCIENCE Matter and Energy 1. Macmillan Reference, 1998.
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