For finding samples of this genre, you might want to go to Google and select educational Websites that have .edu as their domain. Since this is a very new development in classroom teaching, there are not many resources in the library that provide sample classroom Websites.
The OED is widely regarded as the most significant dictionary of the English language, offering the meaning, history, and pronunciation of more than 600,000 words —past and present— from across the English-speaking world.
