BEDFORD, K. (2010). ENERGY OUR WORLD: COAL. S.CHAND PUBLISHING.
Chicagoスタイル(17版)引用形式BEDFORD, KATE. ENERGY OUR WORLD: COAL. NEW DELHI: S.CHAND PUBLISHING, 2010.
MLA(9版)引用形式BEDFORD, KATE. ENERGY OUR WORLD: COAL. S.CHAND PUBLISHING, 2010.
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