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AMA style

David Weinberg. "Definition of Zone". In Alexandrite Tsarstone Collectors Guide. July 03, 2010, 04:52 UTC. Available at: http://w.alexandrite.com/viewpage.html?id=GG-085-00002. Accessed July 25, 2026.

APA style

"Definition of Zone". (2010, July 03). In Alexandrite Tsarstone Collectors Guide. Retrieved 04:07, July 25, 2026, from http://w.alexandrite.com/viewpage.html?id=GG-085-00002.

Bluebook style

"Definition of Zone", http://w.alexandrite.com/viewpage.html?id=GG-085-00002 (last visited July 25, 2026).

Bluebook: Harvard JOLT style

See Alexandrite Tsarstone Collectors Guide, "Definition of Zone", http://w.alexandrite.com/viewpage.html?id=GG-085-00002 (A group of crystal faced intersection, which are parallel to a common line.) (as of Jul. 25, 2026, 04:07 GMT).

CBE/CSE style

David Weinberg. "Definition of Zone". In Alexandrite Tsarstone Collectors Guide. 2010 Jul 03, 04:52 UTC.[Internet], Alexandrite Tsarstone Collectors Guide; 2010 Jul 03, 04:52 UTC [cited 2026 Jul 25]. Available from: http://w.alexandrite.com/viewpage.html?id=GG-085-00002.

Chicago style

David Weinberg, "Definition of Zone", http://w.alexandrite.com/viewpage.html?id=GG-085-00002, (accessed July 25, 2026).

MLA style

"Definition of Zone". Alexandrite Tsarstone Collectors Guide. 03 Jul 2010, 04:52 UTC. 25 Jul 2026 http://w.alexandrite.com/viewpage.html?id=GG-085-00002

MHRA style

David Weinberg, "Definition of Zone", Alexandrite Tsarstone Collectors Guide, 03 July 2010, 04:52 UTC, http://w.alexandrite.com/viewpage.html?id=GG-085-00002 [accessed 25 July 2026].