LEVETE, S. (2010). ENERGY OUR WORLD: GAS. S.CHAND PUBLISHING.
Lua i Stíl Chicago (17ú heag.)LEVETE, SARAH. ENERGY OUR WORLD: GAS. NEW DELHI: S.CHAND PUBLISHING, 2010.
Lua MLA (9ú heag.)LEVETE, SARAH. ENERGY OUR WORLD: GAS. S.CHAND PUBLISHING, 2010.
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