Cladistics

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.
www.ucmp.berkeley.edu/clad/clad1.html

Phylogenetics Methodology - Introduction to various phylogenetic statistical methodologies.
research.amnh.org/~siddall/methods/

Understanding Cladistics - Short introduction from the American Museum of Natural History.
www.amnh.org/exhibitions/Fossil_Halls/cladistics.html

What is Cladistics? - The methods and terminology of phylogenetic systematics explained by the magazine Fossil News.
www.fossilnews.com/1996/cladistics.html

Willi Hennig Society - Society of scientists studying cladistics.
www.cladistics.org