[1]^"Meaning of Flowers"..
[2]^"The Filāḥa Texts Project". Archived from the original on 29 June 2012..
[3]^Le livre de l'agriculture d'Ibn al-Awam = Kitab al-felahah = Kitāb al-filāḥah; traduit de l'arabe par J.J. Clément-Mullet. OCLC 777087981..
[4]^"Rosegathering symbolic meaning of color in roses". Archived from the original on 7 October 2011..
[5]^"Plant gene replacement results in the world's only blue rose". Phys.Org website. 4 April 2005. Archived from the original on 5 February 2012..
[6]^Nosowitz, Dan (15 September 2011). "Suntory Creates Mythical Blue (Or, Um, Lavender-ish) Rose". Popular Science. Archived from the original on 24 December 2011. Retrieved 30 August 2012..
[7]^Danielle Demetriou (31 October 2008). "World's first blue roses after 20 years of research". The Daily Telegraph. Archived from the original on 3 December 2017..
[8]^Katsumoto Y; et al. (2007). "Engineering of the Rose Flavonoid Biosynthetic Pathway Successfully Generated Blue-Hued Flowers Accumulating Delphinidin". Plant Cell Physiol. 48 (11): 1589–1600. doi:10.1093/pcp/pcm131. PMID 17925311. Archived from the original on 28 May 2015..
[9]^Julian Ryall (2 May 2008). "My love is like a blue, blue rose". Telegraph.co.uk. Archived from the original on 9 April 2008..
[10]^Kyodo (11 September 2011). "Suntory to sell blue roses overseas". The Japan Times. Archived from the original on 22 November 2012. Retrieved 30 August 2012..
[11]^"World's First 'Blue' Rose Soon Available in U.S." WIRED. 14 September 2011. Archived from the original on 17 March 2014..
[12]^"About Blue Roses". GardenGuides. Archived from the original on 13 July 2010..
[13]^"Blue Roses and Jonquils in The Glass Menagerie". www.shmoop.com. Archived from the original on 17 September 2016. Retrieved 7 September 2016..