APA (7th ed.) Citation

Idriess, I. L. (1967). Opals and sapphires: How to work, mine, class, cut, polish and sell them. Angus and Robertson.

Chicago Style (17th ed.) Citation

Idriess, Ion Llewellyn. Opals and Sapphires: How to Work, Mine, Class, Cut, Polish and Sell Them. [Sydney]: Angus and Robertson, 1967.

MLA (9th ed.) Citation

Idriess, Ion Llewellyn. Opals and Sapphires: How to Work, Mine, Class, Cut, Polish and Sell Them. Angus and Robertson, 1967.