Tham khảo Ngọc trai

  1. ↑ Neil H. Landman, et al (2001) Pearls: A Natural History, Harry Abrams, Inc., 232 pp., ISBN 0-8109-4495-2 Reviewed: http://nationalzoo.si.edu/Publications/ZooGoer/2002/1/books.cfm
  2. ↑ “Pearl Oyster Farming and Pearl Culture”. 
  3. ↑ How Pearls are Formed: The Pearl Sac Theory http://www.perlas.com.mx/english/pearlsac.html
  4. ↑ Imperial Deltah on Lao Tzu (one of the most established century old pearl jewelers). See also Pearl Guide's reference to it though less extensive: Pearl Guide on Lao Tzu

Tài liệu tham khảo

WikiPedia: Ngọc trai http://www.farlang.com/gemstones/kunz_book_of_the_... http://www.farlang.com/gemstones/streeter_pearls_a... http://www.pearl-guide.com/famous-pearls.shtml http://www.pearl-guide.com/pearl-weight.shtml http://www.pearls.com/education/famous_pearls.htm http://nationalzoo.si.edu/Publications/ZooGoer/200... http://www.geo.utexas.edu/courses/347k/redesign/ge... http://www.perlas.com.mx/english/pearlsac.html http://www.fao.org/docrep/field/003/AB726E/AB726E1... http://www.pbs.org/wgbh/nova/pearl/time.html