» Introduction to Cladistics Cladistics is a particular method of hypothesizing relationships among organisms based on the idea that members of a group share a common evolutionary history. http://www.ucmp.berkeley.edu/clad/clad1.html
» Phylogenetics Methodology Introduction to various phylogenetic statistical methodologies. http://research.amnh.org/~siddall/methods/
» Understanding Cladistics Short introduction from the American Museum of Natural History. http://www.amnh.org/exhibitions/Fossil_Halls/cladistics.html
» What is Cladistics? The methods and terminology of phylogenetic systematics explained by the magazine Fossil News. http://www.fossilnews.com/1996/cladistics.html
» Willi Hennig Society Society of scientists studying cladistics. http://www.cladistics.org