When I asked a metaphor related question, that is now closed, I was told to read the following article by Richard Nordquist about the different metaphor types. I am now looking for a more authoritative reference to read more about it as I don't feel like I am quite grasping the classifications here. Can anyone recommend me a book or give me a name of the field that studies metaphors in detail and classifies them?
Additionally, there was mention of one more metaphor type called a 'universal metaphor' that is not covered in the above article. What is meant by a universal metaphor?