diff --git a/FAQ/PrologReading.txt b/FAQ/PrologReading.txt
index 3e99132..0535613 100644
--- a/FAQ/PrologReading.txt
+++ b/FAQ/PrologReading.txt
@@ -8,13 +8,13 @@ this topic after seeing this message on comp.lang.prolog:
     take a look at these links:
 
     * http://kti.mff.cuni.cz/~bartak/prolog/ - Roman Barták
-    * http://www.csupomona.edu/~jrfisher/www/prolog_tutorial/contents.html - J R Fischer
+    * https://skolemmachines.org/ThePrologTutorial/ - J R Fischer
     * http://www.amzi.com/AdventureInProlog/ - Dennis Merritt and Amzi! inc.
     * http://www.compapp.dcu.ie/~alex/LOGIC/start.html - James Power and Alex Monaghan
     * http://www.arch.su.edu.au/~jose/prolog/tutorial.html - José Damski
     * http://cs.wwc.edu/~cs_dept/KU/PR/Prolog.html - Anthony Aaby
     * http://www.dcs.qmw.ac.uk/~mmh/AINotes/ - Matthew Muntbach
-    * http://www.dcs.kcl.ac.uk/teaching/units/cs2lap/notes.html - Dov Gabbay and Ulle Endriss 
+    * http://www.dcs.kcl.ac.uk/teaching/units/cs2lap/notes.html - Dov Gabbay and Ulle Endriss
 
 Here are some links, if they are helpful, help yourself.
 
diff --git a/Links.txt b/Links.txt
index bb1608c..99a6ef2 100644
--- a/Links.txt
+++ b/Links.txt
@@ -30,7 +30,7 @@ SWI-Prolog [[packages][</packages/>]]
     * [[A Wikibook on Prolog.  Please contribute!][http://en.wikibooks.org/wiki/Programming:Prolog]]
     * [[Learn Prolog Now!][http://www.learnprolognow.org/]] by Patrick Blackburn, Johan Bos and Kristina Striegnitz [[star.gif]]
     * [[Natural Language Processing Techniques in Prolog][http://cs.union.edu/~striegnk/courses/nlp-with-prolog/html/]] by Patrick Blackburn and Kristina Striegnitz
-    * [[A Prolog Tutorial][http://www.cpp.edu/%7Ejrfisher/www/prolog_tutorial/contents.html]] by J.R. Fisher
+    * [[A Prolog Tutorial][https://skolemmachines.org/ThePrologTutorial/]] by J.R. Fisher
     * [[Some notes for getting started using Prolog][http://www2.dcs.hull.ac.uk/NEAT/dnd/AI/beginprolog.html]] by Jesse Monroy, Jr.
     * [[Logic, Programming and Prolog (2ed)][http://www.ida.liu.se/%7Eulfni/lpp/]]
     * [[More Prolog Reading material from the FAQ][</FAQ/PrologReading.html>]]