Comparing Open Source CMSes: Joomla, Drupal and Plone
http://www.idealware.org/articles/joomla_drupal_plone.php

Bonfield, Brett and Laura Quinn
IdealWare
2007

Abstract:

Open source content management systems can make creating and managing your website a lot easier - and there's no licensing fee involved. But which should you use? We look carefully at Joomla, Drupal, and Plone to compare their strengths and weaknesses.