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Petursson, Sigthor. (). Three Forms of Energi (No. 7. Vol. 80 Juli-2003). : Bag. Serial Journal of Chemical Education.

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Petursson, Sigthor. Three Forms of Energi. No. 7. Vol. 80 Juli-2003 : Bag. Serial Journal of Chemical Education, . Index Artikel.

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Petursson, Sigthor. Three Forms of Energi. No. 7. Vol. 80 Juli-2003 : Bag. Serial Journal of Chemical Education, . Index Artikel.

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Petursson, Sigthor. Three Forms of Energi. No. 7. Vol. 80 Juli-2003 : Bag. Serial Journal of Chemical Education, . Index Artikel.