http://en.wikipedia.org/wiki/The_Magical_Number_Seven%2C_Plus_or_Minus_Two
external links from wiki
- George A. Miller. The Magical Number Seven, Plus or Minus Two. The Psychological Review, 1956, vol. 63, Issue 2, pp. 81-97
- Another online version of the same paper
- In-depth discussion on many myths around Miller’s paper at Edward Tufte’s site.
- The 7±2 Urban Legend (pdf file)
