7Teresa J,Farney.How'bout them apples/Consumer demandleads to delicious fruit year[J].Gazette,The(Colorado Springs),2003.
8William Kaye-Blake,Kathryn Bicknell;Caroline Saunders.Process versus product:which determines consumer demand for ge-netically modified apples?[J].Australian Journal of Agricultural andResource Economics,2005,49(4):413-427.
9Robertson, J. L. and Chatfield, L. H.: Fresh Flower Merchandising in Loose Bunches, HortScience, 17(4) :593-595, 1982.
10Shafer, B. S. and Kelly, J. W.: The Influence of Cultivar, Price, and Longevity on Consumer Preferences for Potted Chrysanthemums, HortScience, 21(6): 1412-1413, 1986.