APA
(2004). Jewellery and Gemstone directory. Jewellery News, Kongkong: .
Chicago
2004. Jewellery and Gemstone directory. Jewellery News, Kongkong: .
Harvard
(2004). Jewellery and Gemstone directory. Jewellery News, Kongkong: .
MLA
Jewellery and Gemstone directory. Jewellery News, Kongkong: . 2004.