1. W. Schumann, Gemstones of the world (Sterling Publishing, New York, 1997) pp. 154–157.
2. R. J. Beck and M. Mason, Mana Pounamu: New Zealand jade (Reed Publishing, Auckland, 2002) pp. 149–165.
3. K. Wallis, Gemstones: understanding, identifying, and buying (Antique Collectors' Club Ltd, Suffolk, England, 2006) pp. 55–56.