Academic citation for Python

[Ross Lazarus]

How should the Python language be cited in an academic publication?

For example, in 
http://bioinformatics.oupjournals.org/cgi/reprint/17/8/756.pdf the 
author mentions http://www.python.org in the text rather than formally 
citing the primary source - or is that the appropriate primary source 
and recommended attribution?

I found "Copyright 1991-1995 by Stichting Mathematisch Centrum, 
Amsterdam, The Netherlands" at http://www.python.org/doc/Copyright.html, 
but that doesn't seem as complete or helpful as I'd like for a refereed 
journal.