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AMA style

David Weinberg. "Definition of Yttrium". In Alexandrite Tsarstone Collectors Guide. July 03, 2010, 05:51 UTC. Available at: http://www.alexandrite.net/viewpage.html?id=GG-084-00005. Accessed May 22, 2013.

APA style

"Definition of Yttrium". (2010, July 03). In Alexandrite Tsarstone Collectors Guide. Retrieved 16:47, May 22, 2013, from http://www.alexandrite.net/viewpage.html?id=GG-084-00005.

Bluebook style

"Definition of Yttrium", http://www.alexandrite.net/viewpage.html?id=GG-084-00005 (last visited May 22, 2013).

Bluebook: Harvard JOLT style

See Alexandrite Tsarstone Collectors Guide, "Definition of Yttrium", http://www.alexandrite.net/viewpage.html?id=GG-084-00005 (A dark gray, silvery luster, rare earth metallic element of the Periodic System with the symbol Y. Flammable when powder from. Used in alloys and as a metal deoxidizer.) (as of May. 22, 2013, 16:47 GMT).

CBE/CSE style

David Weinberg. "Definition of Yttrium". In Alexandrite Tsarstone Collectors Guide. 2010 Jul 03, 05:51 UTC.[Internet], Alexandrite Tsarstone Collectors Guide; 2010 Jul 03, 05:51 UTC [cited 2013 May 22]. Available from: http://www.alexandrite.net/viewpage.html?id=GG-084-00005.

Chicago style

David Weinberg, "Definition of Yttrium", http://www.alexandrite.net/viewpage.html?id=GG-084-00005, (accessed May 22, 2013).

MLA style

"Definition of Yttrium". Alexandrite Tsarstone Collectors Guide. 03 Jul 2010, 05:51 UTC. 22 May 2013 http://www.alexandrite.net/viewpage.html?id=GG-084-00005

MHRA style

David Weinberg, "Definition of Yttrium", Alexandrite Tsarstone Collectors Guide, 03 July 2010, 05:51 UTC, http://www.alexandrite.net/viewpage.html?id=GG-084-00005 [accessed 22 May 2013].