Molecular Mechanics
   A tutorial published by the Center for Molecular Modeling of the U.S. National Institutes of Health.
   http://cmm.info.nih.gov/modeling/guide_documents/molecular_mechanics_document.html

Molecular Mechanics and Dynamics
   Practical tutorial on the topic, including an overview of force field selection and applications.
   http://www.chem.swin.edu.au/modules/mod6/