BEDFORD, K. (2010). ENERGY OUR WORLD: COAL. S.CHAND PUBLISHING.
Chicago-čujuhus (17. p.)BEDFORD, KATE. ENERGY OUR WORLD: COAL. NEW DELHI: S.CHAND PUBLISHING, 2010.
MLA-čujuhus (9. p.)BEDFORD, KATE. ENERGY OUR WORLD: COAL. S.CHAND PUBLISHING, 2010.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.