APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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