«Non-cultivated Edible Fleshy Fungi» (անգլերեն). Վերցված է 2015 թ․ ապրիլի 4-ին. «...it has been known for more than a century that truffles were mycorrhizal on various trees such as oak, beech, birch, hazels, and a few others»
Jeandroz, S., Murat, C., Wang, Y., Bonfante, P., Le Tacon, F. (2008). Molecular phylogeny and historical biogeography of the genus Tuber, the true truffles. Journal of Biogeography, 35 (5), 815-829. DOI : 10.1111/j.1365-2699.2007.01851.x (անգլ.)
