1. The American heritage dictionary of the English language,1969
2. Webster's third new international dictionary,1986
3. Webster's encyclopedic unabridged dictionary of the English language,1994
4. National Nanotechnology Initiative. Available at: www.nano.gov. Accessed September 2004.
5. Fisher E, Bennett-Woods D, Hornyak L, et al. for the Task Force on Nano-Ethics and Societal Impacts. Welcoming the nano age. Colorado Nanotechnology Initiative, September 2003.