Any nonfiction book recommendations about language as a key to identity?

Answer 1

I haven't read any of these books, but you should find something suitable here.

http://www.google.com/#q=book+language+as+a+key+to+identity

Answer 2

Ernesto Galarza's book, Barrio Boy, and Richard Rodriguez's book, Hunger of Memory, are excellent for this purpose. They are both autobiographical, therefore non-fiction.