my @AoH=( { chapter => "Basic",			  
            page  => (
                       { paragraph => "lesson1"},
                       { paragraph => "lesson2"}
                     ) 
          },
          { chapter => "Advanced",
            page  => (
                       { paragraph => "lesson3"},
                       { paragraph => "lesson4"}
                     ) 
          }
        );

##</code><code>##

print $AoH[1]{page}{paragraph};

printed: lesson3

##</code><code>##

print $AoH[1]{page}[1]{paragraph};

printed: not an ARRAY reference