Do we need occupational licensing?

Alan Krueger writes:

In a new book, "Licensing Occupations: Ensuring Quality or Restricting
Competition?" (Upjohn Institute, 2006), Morris M. Kleiner, an economist
at the University of Minnesota, questions whether occupational
licensing has gone too far. He provides much evidence that the balance
of occupational licensing has shifted away from protecting consumers
and toward limiting the supply of workers in various professions. A
result is that services provided by licensed workers are more expensive
than necessary and that quality is not noticeably affected.

Read more here.  I can’t yet find this listed on Amazon.com, any pointers?  Here is a pdf of part of the book.  Here is a home page for the book.