Thomas, L. (2013). Coal geology (2nd ed.). John Wiley & Sons.
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Dyfyniad Arddull Chicago
Thomas, Larry. Coal Geology. 2nd ed. Chichester, West Sussex ; Hoboken, N.J.: John Wiley & Sons, 2013.
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Dyfyniad MLA
Thomas, Larry. Coal Geology. 2nd ed. John Wiley & Sons, 2013.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.