Other
Microeconomics Chapter 6: Price Elasticity of Supply
Scrolling down towards the bottom of this site, there are equations, diagrams, and some general information concerning price elasticity of supply.
Tutor2u
Tutor2u: Income Elasticity of Demand
This site provides a detailed study of income elasticity, which is how one's demand changes as income changes. It also gives good examples of normal and inferior goods.
Khan Academy
Khan Academy: Lesson Overview Cross Price Elasticity/income Elasticity of Demand
In a previous lesson we learned about price elasticity of demand, but there are many other types of elasticity that measure how agents respond to variables other than the change in a good's price. Two of these are Cross Price Elasticity...
Khan Academy
Khan Academy: Elasticity in Areas Other Than Price
Elasticity also applies in labor markets and in financial capital markets.
Khan Academy
Khan Academy: Income Elasticity of Demand
Practice what you've learned about income elasticity of demand in this four-question exercise.