Gaya APA

Symes, R, F., Harding, R, R. (2002). Eyewitness Crystal & Gem . London: Dorling Kindersley Limited.

Gaya MLA

Symes, R., F.., Harding, R., R.. "Eyewitness Crystal & Gem". London: Dorling Kindersley Limited, 2002. Text.