O'Leary, B. (1977). A field guide to Australian opals. Rigby.
Chicago Style (17th ed.) CitationO'Leary, Barrie. A Field Guide to Australian Opals. Adelaide: Rigby, 1977.
MLA (8th ed.) CitationO'Leary, Barrie. A Field Guide to Australian Opals. Rigby, 1977.
Warning: These citations may not always be 100% accurate.