Three types of informational references are a. encyclopedias, dictionaries and thesaurus c. almanacs, atlases and thesauruses b. atlases, almanacs, and encyclopedias d. all of these

For me the most informational references are D, all of the above is the answer because all of them can be an informational reference that you can use in your research or other thing that you need to work on. They are all important and can be a good help for your thesis paper or researches. The answer is D.

Did you know it's illegal to own only one guinea pig in switzerland?   : )