Chiral Publishing
Chiral Publishing: An Introduction to Chemistry: Predicting Molecular Polarity
This section in the online textbook describes how to tell if a molecule is polar or non polar. Detailed steps and examples are good references. Also find links to presentations and chapter maps for other chemistry topics.
Michael Blaber, PhD
Fsu: Molecular Geometry and Bonding Theories: Polarity of Molecules
Florida State University provides a discussion of polarity of binary and polyatomic molecules, with tables and graphics.