APA (7th ed.) Citation

Semrád, P. (2011). The story of European precious opal from Dubník. Granit.

Chicago Style (17th ed.) Citation

Semrád, Peter. The Story of European Precious Opal from Dubník. Praha: Granit, 2011.

MLA (9th ed.) Citation

Semrád, Peter. The Story of European Precious Opal from Dubník. Granit, 2011.

Warning: These citations may not always be 100% accurate.