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Dyfyniad Arddull ChicagoTowler, Brian F. The Future of Energy. London, UK: Academic Press/Elsevier, 2014. https://doi.org/10.1016/C2013-0-19049-6.
Dyfyniad MLATowler, Brian F. The Future of Energy. Academic Press/Elsevier, 2014. https://doi.org/10.1016/C2013-0-19049-6.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.