APA
World Gold Council, . (1997). The assaying and refining of gold : a guid for the gold jewellery producer. auth., London: .
Chicago
World Gold Council, . 1997. The assaying and refining of gold : a guid for the gold jewellery producer. auth., London: .
Harvard
World Gold Council, . (1997). The assaying and refining of gold : a guid for the gold jewellery producer. auth., London: .
MLA
World Gold Council, . The assaying and refining of gold : a guid for the gold jewellery producer. auth., London: . 1997.