Tertiary sources compile, summarize, index, or help identify scholarly sources on a topic. They are useful for background research or to get an overview of a topic before delving into secondary or primary sources. Common tertiary sources for modern languages include dictionaries, encyclopedias, handbooks, and other reference sources. Below are two encyclopedias on sustainability topics that you can access through the library.
You can also search the library catalog for the words encyclopedia of sustainability to find a selection of books that give an overview of several aspects of sustainability. Here are a few to get started: