In complement to Corion's answer: Re: sorting hash by a certain value (that it is in an array)

Here is an example. You can use more complexe sorting method (see commented line: lc(...) cmp lc(...)) and optimized it with The Orcish Maneuver.

#!/usr/bin/env perl

use strict;
use warnings;

my %books=(
    '34' => ['enlgish', 'dani M. rod', 54],
    '24' => ['spanish', 'ramk rovale', 41],
    '54' => ['enlgish', 'bob falicas', 17],
);


my @sorted_books = sort {
    $books{$a}->[1] cmp $books{$b}->[1]
    #lc($books{$a}->[1]) cmp lc($books{$b}->[1])
} keys %books;

print "@sorted_books";
[download]

Update: print sorted books

for my $book_id (@sorted_books) {
    print "$book_id: ",join ", ",@{ $books{$book_id} };
    print "\n";
}
[download]

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