Opal (apple) (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Opal (apple)" in English language version.

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cas.cz

"OPAL Information" (PDF). Institute of Experimental Botany. Retrieved 20 December 2012.
"Certificate on the grant of Community Plant Variety Rights" (PDF). Institute of Experimental Botany. Retrieved 20 December 2012.

Brown, S.K.; Maloney, K. E. (Fall 2009). "Making Sense of New Apple Varieties, Trademarks and Clubs: Current Status" (PDF). New York Fruit Quarterly. 17 (3). Geneva, NY: Department of Horticultural Sciences, Cornell University: 11. Archived from the original (PDF) on 2016-03-04. Retrieved 2012-12-20.

"US: Popularity of Opal apple continues to grow". The Global Fruit. Nov 2012. Archived from the original on June 26, 2013. Retrieved 20 December 2012.

"Apple growers marketing tasty new varieties". WCF Courier. October 20, 2010. Retrieved 20 December 2012.

"US: Popularity of Opal apple continues to grow". The Global Fruit. Nov 2012. Archived from the original on June 26, 2013. Retrieved 20 December 2012.
Brown, S.K.; Maloney, K. E. (Fall 2009). "Making Sense of New Apple Varieties, Trademarks and Clubs: Current Status" (PDF). New York Fruit Quarterly. 17 (3). Geneva, NY: Department of Horticultural Sciences, Cornell University: 11. Archived from the original (PDF) on 2016-03-04. Retrieved 2012-12-20.