Best sources to understand the Wigner-Eckart theorem?

[andresB]

I have to admit that my understanding of the Wigner-Eckart is quite precarious. In my grad studies I try to learn it using Sakurai and I suspect that might have been the wrong choice. So, what books-articles better explain the Wigner-Eckart theorem?

 

[DrClaude]

A classic on the subject is M.E. Rose, Elementary Theory of Angular Momentum (Dover, 1995).