Smith M.L; Bruhn J.M. & Anderson J.B. 1992. The fungus Armillaria bulbosa is among the largest and oldest living organisms. Nature356 (6368): 428–431. [2]
wisc.edu
botit.botany.wisc.edu
Volk T.J. 2002. The Humongous Fungus – ten years later. Department of Biology, University of Wisconsin. [1]