Swiss Air. Press Release . 1997. June 3rd.
USDA (US Department of Agriculture). 1998. USDA to make fundamental changes in revised proposed rule on organic standards. Agricultural Marketing Service Press Release. [Online]. Available: http://www.ams.usda.gov/news/orgrule.htm.
USDA (US Department of Agriculture). 1999. USDA to issue more than $1.3 billion in CRP payments. Farm Service Agency News Release. [Online]. Available: htp://www.fsa.usda.gov/pas/news/releases/1999/10/0391.htm
USDA (US Department of Agriculture). 2000. USDA Mission. [Online]. Available: http://www.usda.gov/mission/miss-toc.htm.
University of California SAREC (Sustainable Agriculture Research and Education Program). 1999. Biologically Integrated Farming Systems Fact Sheet October 1999. [Online] Available: http://www.sarep.ucdavis.edu/bifs/factsheet.htm
Venstrom, D., and J. E. Amoore. 1968. Olfactory threshold in relation to age, sex or smoking. J. Food Sci. 33:264–265.
Vickery, P. J. 1988. Integrated fruit production (IFP): an overview of programs. Sandpoint, Idaho: Benbrook Consulting Services. [Online]. Available http://www.pmac.net/intefrt.htm.
Wolf, S. 1996. Privatization of Crop Production Service Market: Spatial Variation and Policy Implications. Unpublished Ph.D. thesis, University of Wisconsin-Madison, Institute for Environmental Studies.
Yarrow, J. 1998. Beyond Organic Agriculture. Growing Solutions, Summer 1998. Portland, Oreg.: The Food Alliance.
Zilberman, D., D. Sunding, M. Dobler, M. Campbell, and A. Manale. 1994. Who makes pesticide use decions: Implications for policymakers. Pp.23–39 in Pesticide Use and Produce Quality, W. Armbruster, ed. Oak Brook, Ill.: Farm Foundation.
Zweig, G. 1970. The vanishing zero: The evolution of pesticide analysis. In Essays of Toxicology, Vol. 2, New York: Academic Press.