Willer, H. (2007). The World of Organic Agriculture: Statistics and Emerging Trends 2007 (9., Ed., totally rev. and updated.). IFOAM.
Chicago-Zitierstil (17. Ausg.)Willer, Helga. The World of Organic Agriculture: Statistics and Emerging Trends 2007. 9., Ed., totally rev. and updated. Bonn: IFOAM, 2007.
MLA-Zitierstil (9. Ausg.)Willer, Helga. The World of Organic Agriculture: Statistics and Emerging Trends 2007. 9., Ed., totally rev. and updated. IFOAM, 2007.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.