A book with the physical traits of different ethnies?

[Scipion_Emilien]

Im searching a reference book about the different traits that each human ethnies tend to have. It would help to visualize my characters and my drawings of them. Any one have an idea about a reference? Or at least something that could help me do a search? I try some keyword on amazon and I don't really know which one to use to get what I want.

N.B. I do not want a book about racism or with racism or political idea in it. I only want something that tell what the average people of what ethnies look like and not something that tell me that because you are a chinese, and thus smaller than the other ethnic group, you are less worthy individual.