redirect_to and route mapper question


I have a question about route mapper and redirect_to. In routes.rb,
there are two url mappings

map.connect 'app/person/:person_name', :controller => 'app', :action
=> 'person_profile'
map.connect 'app/person/:person_name/book/:book_id', :controller =>
'app', :action => 'personal_reading'

In the controller, i can redirect to the first mapping using

redirect_to :action=> "person_profile", :id=>@personal_name

But I don't know how to redirect to the 2nd mapping. Could you please
tell me how to solve it? or tell me how to design url structure in
RoR? thanks!