"Thorium" pán-pún chi-kan bô-kāng--ê tē-hng

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* {{cite book |last1=Greenwood |first1=N. N. |author-link1=Norman Greenwood |last2=Earnshaw |first2=A. |year=1997 |title=Chemistry of the Elements |edition=2nd |publisher=Butterworth-Heinemann |isbn=978-0-08-037941-8}}

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* {{cite web |first1=B. W. |last1=Jordan |first2=R. |last2=Eggert |first3=B. |last3=Dixon|first4=B. |last4=Carlsen |display-authors=3 |year=2014 |url=http://econbus.mines.edu/working-papers/wp201407.pdf |archive-url=https://web.archive.org/web/20170630194355/http://econbus.mines.edu/working-papers/wp201407.pdf |archive-date=30 June 2017 |title=Thorium: Does Crustal Abundance Lead to Economic Availability?|publisher=[[Colorado School of Mines]] |access-date=29 September 2017}}

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{{Commons|Thorium}}

{{Wiktionary|thorium}}