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WikiPedia: Sản_xuất_cây_Giáng_Sinh http://www.dpi.vic.gov.au/dpi/nreninf.nsf/93a98744... http://www.iht.com/articles/2000/12/23/mxmas.t.php https://web.archive.org/web/20110520112339/http://... http://www.metro.co.uk/news/article.html?in_articl... http://www.terradaily.com/reports/Danish_Christmas... https://www.bbc.co.uk/news/world-europe-11863768 http://plant-materials.nrcs.usda.gov/news/features... https://web.archive.org/web/20060922210444/http://... http://www.nass.usda.gov/census/census02/volume1/u... https://web.archive.org/web/20071003035454/http://...