APA (7th ed.) Citation

Zwaan, J. C. (2006). Gemmology, geology and origin of the Sandawana emerald deposits, Zimbabwe. Nationaal Natuurhistorisch Museum.

Chicago Style (17th ed.) Citation

Zwaan, Johannes Cornelis. Gemmology, Geology and Origin of the Sandawana Emerald Deposits, Zimbabwe. Leiden: Nationaal Natuurhistorisch Museum, 2006.

MLA (9th ed.) Citation

Zwaan, Johannes Cornelis. Gemmology, Geology and Origin of the Sandawana Emerald Deposits, Zimbabwe. Nationaal Natuurhistorisch Museum, 2006.

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