bjective-C</strong></p>
<ul>
<li><a rel="nofollow" href="http://developer.apple.com/DOCUMENTATION/Cocoa/Conceptual/ObjectiveC/">The Objective-C Programming Language</a></li>
</ul>
<p><strong>Parrot / Perl 6</strong></p>
<ul>
<li><a rel="nofollow" href="https://github.com/perl6/book/">Perl 6</a> (Work in progress)</li>
</ul>
<p><strong>Perl</strong></p>
<ul>
<li><a rel="nofollow" href="http://hop.perl.plover.com/book/">Higher Order Perl</a></li>
<li><a rel="nofollow" href="http://www.greenteapress.com/perl/"