s{http://}{https://}

source/resources/index.html

@@ -104,7 +104,7 @@ <h3>Practice Online</h3>
       	<h3>Books published or in work</h3>
       	<ul class="shy-list">
 	  <li><a href="https://deeptext.media/perl6-at-a-glance/">Perl 6 at a Glance</a>, by Andrew Shitov [published, print]</li>
-	  <li><a href="http://shop.oreilly.com/product/0636920065883.do">Think Perl 6: How to Think Like a Computer Scientist</a>, by Laurent Rosenfeld [in work]</li>
+	  <li><a href="https://shop.oreilly.com/product/0636920065883.do">Think Perl 6: How to Think Like a Computer Scientist</a>, by Laurent Rosenfeld [in work]</li>
 	  <li><a href="https://leanpub.com/perl6">Perl 6 by Example</a>, by Moritz Lenz [in work, e-book]</li>
           <li><a href="https://www.learningperl6.com/">Learning Perl 6</a>, by Brian D. Foy [in work]</li>
         </ul>