Leland Wilkinson.
Dot Plots.
In The American Statistician, vol. 53, no. 3, pp. 276--281, 1999.

Bibtex:

@Article{        wilkinson:1999:DP,
  author = 	 "Leland Wilkinson",
  title = 	 "Dot Plots",
  journal = 	 "The American Statistician",
  year = 	 "1999",
  volume = 	 "53",
  number = 	 "3",
  pages = 	 "276--281",
  month = 	 "August",
}