Thesausarus is as same as a dictionary, just has some more words.
An audiobook is also not that useful.
So I would say that an Encyclopedia an example of a multi media source.
<span>The organism with snake like tentacles around it's mouth is a hydra.</span>
C. Get the most out of what you read
<span> Descartes was the father of "foundational epistemology" . This is a theory of knowledge that tries to find a basis for saying one knows by starting from a few "unassailable" beliefs. So, he used a method of radical doubt, looking closely at his beliefs and finding out which ones could be doubted without contradiction, and found that most could. He stumbled upon the fact that even to doubt one exists requires that one exists to have the doubt. Thus, his words are best translated "I am conscious, therefore I exist". </span>
