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Help With Association Object Mapping

 
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Mac OS X IntelliJ IDE Chrome
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I don't expect a solution here because I know that the information has to be out there. I just don't know what it is called. I have three objects.

User
Role
Book

I need to map some sort of UserBookRole object. Book and User is a ManyToMany. A user can have different roles for different books. For example


So what is this type of association called and where can I go to learn how to create the mappings correctly?

Thanks.
 
Gregg Bolinger
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Many valued entity association. Alright, found it in my book. But would like some feedback.



And then in my Book object I have this:



Does that look right?
 
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