diff --git a/www/index.html b/www/index.html
index c25b69f..c0cefb9 100644
--- a/www/index.html
+++ b/www/index.html
@@ -24,7 +24,7 @@ It also implements R6RS libraries and all built-in R6RS syntactic forms.
 <p>
 The system is documented in the R6RS and also described, with numerous
 examples, in Section&nbsp;3.1 and Chapter&nbsp;8 of
-<a  href="../tspl4/index.html">The Scheme Programming
+<a href="//www.scheme.com/tspl4/">The Scheme Programming
 Language, 4th edition</a>.
 
 <p>
diff --git a/www/old-psyntax.html b/www/old-psyntax.html
index aa7c15b..f4cfb86 100644
--- a/www/old-psyntax.html
+++ b/www/old-psyntax.html
@@ -25,9 +25,9 @@ modules.
 
 <p>
 The system is documented in Section&nbsp;3.1 and Chapter&nbsp;8 of
-<a  href="http://www.scheme.com/tspl3/">The Scheme Programming
+<a href="//www.scheme.com/tspl3/">The Scheme Programming
 Language, third edition</a> and in Chapter 9 of the
-<a  href="http://www.scheme.com/csug7/">Chez Scheme Version 7 User's
+<a href="//www.scheme.com/csug7/">Chez Scheme Version 7 User's
 Guide</a>.
 The former has more introductory material and examples, while the
 latter documents some