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AMA style

David Weinberg. "Definition of Needle". In Alexandrite Tsarstone Collectors Guide. July 03, 2010, 04:50 UTC. Available at: http://w.alexandrite.com/viewpage.html?id=GG-099-00002. Accessed April 06, 2026.

APA style

"Definition of Needle". (2010, July 03). In Alexandrite Tsarstone Collectors Guide. Retrieved 20:27, April 06, 2026, from http://w.alexandrite.com/viewpage.html?id=GG-099-00002.

Bluebook style

"Definition of Needle", http://w.alexandrite.com/viewpage.html?id=GG-099-00002 (last visited April 06, 2026).

Bluebook: Harvard JOLT style

See Alexandrite Tsarstone Collectors Guide, "Definition of Needle", http://w.alexandrite.com/viewpage.html?id=GG-099-00002 (A thin needle-shaped or acicular crystal, which is an inclusions in certain minerals, such as rutilated quartz, sapphire, or corundum. Sometimes actinolite, goethite, etc. appear in certain crystals. ) (as of Apr. 06, 2026, 20:27 GMT).

CBE/CSE style

David Weinberg. "Definition of Needle". In Alexandrite Tsarstone Collectors Guide. 2010 Jul 03, 04:50 UTC.[Internet], Alexandrite Tsarstone Collectors Guide; 2010 Jul 03, 04:50 UTC [cited 2026 Apr 06]. Available from: http://w.alexandrite.com/viewpage.html?id=GG-099-00002.

Chicago style

David Weinberg, "Definition of Needle", http://w.alexandrite.com/viewpage.html?id=GG-099-00002, (accessed April 06, 2026).

MLA style

"Definition of Needle". Alexandrite Tsarstone Collectors Guide. 03 Jul 2010, 04:50 UTC. 06 Apr 2026 http://w.alexandrite.com/viewpage.html?id=GG-099-00002

MHRA style

David Weinberg, "Definition of Needle", Alexandrite Tsarstone Collectors Guide, 03 July 2010, 04:50 UTC, http://w.alexandrite.com/viewpage.html?id=GG-099-00002 [accessed 06 April 2026].