1. Rosenfeld, H. J.Improving Climate in Northern Grape Growing. Vitinord, Neubrandenburg, Germany, and Szczecin, Poland, Nov 28–Dec 1, 2012;http://vitinord.org/wp-content/uploads/2013/01/Rosenfeld.pdf(accessed March 12, 2013) .
2. Xiaoyan, L.China: Problems of Winter Injury to Vines in the Dry Cold Climate of the Yellow River Valley and some Practical Cultural Solutions. Vitinord, Neubrandenburg, Germany, and Szczecin, Poland, Nov 28–Dec 1, 2012;http://vitinord.org/wp-content/uploads/2013/01/Xiao-yan_LI.pdf(accessed Feb 3, 2013) .
3. Hope-Ross, P.From the Vine to the Glass: Canada’s Grape and Wine Industry. Statistic Canada, 2006;http://publications.gc.ca/collections/Collection/Statcan/11-621-M/11-621-MIE2006049.pdf(accessed May 28, 2012) .