diff --git a/game-programmer.dot b/game-programmer.dot
index adcd135..21d7272 100644
--- a/game-programmer.dot
+++ b/game-programmer.dot
@@ -99,7 +99,7 @@ digraph {
         learntoprogramwithscratch [label=<<TABLE BORDER="0" CELLSPACING="0"><TR><TD WIDTH="100" HEIGHT="100" FIXEDSIZE="TRUE"><IMG SCALE="TRUE" SRC="images/learntoprogramwithscratch.jpg"/></TD></TR><TR><TD>Learn to Program<br/> with Scratch<br/>(2014)</TD></TR></TABLE>> URL="https://www.amazon.com/dp/1593275439/"]
         helpyoukidswithcomputercoding [label=<<TABLE BORDER="0" CELLSPACING="0"><TR><TD WIDTH="100" HEIGHT="100" FIXEDSIZE="TRUE"><IMG SCALE="TRUE" SRC="images/helpyoukidswithcomputercoding.jpg"/></TD></TR><TR><TD>Help Your Kids<br/>with Computer Coding<br/>(2015)</TD></TR></TABLE>> URL="https://www.amazon.com/dp/146541956X/"]
         
-        inventgamepython3 [label=<<TABLE BORDER="0" CELLSPACING="0"><TR><TD WIDTH="100" HEIGHT="100" FIXEDSIZE="TRUE"><IMG SCALE="TRUE" SRC="images/inventgamepython3.jpg"/></TD></TR><TR><TD>Invent Your Own<br/>Computer Games with<br/>Python 3rd Ed (2015)</TD></TR></TABLE>> URL="https://www.amazon.com/dp/1503212300/"]
+        inventgamepython3 [label=<<TABLE BORDER="0" CELLSPACING="0"><TR><TD WIDTH="100" HEIGHT="100" FIXEDSIZE="TRUE"><IMG SCALE="TRUE" SRC="images/inventgamepython3.jpg"/></TD></TR><TR><TD>Invent Your Own<br/>Computer Games with<br/>Python 4th Ed (2016)</TD></TR></TABLE>> URL="https://www.amazon.com/dp/1593277954/"]
         makinggamespython [label=<<TABLE BORDER="0" CELLSPACING="0"><TR><TD WIDTH="100" HEIGHT="100" FIXEDSIZE="TRUE"><IMG SCALE="TRUE" SRC="images/makinggamespython.jpg"/></TD></TR><TR><TD>Making Games with<br/>Python &amp; Pygame (2012)</TD></TR></TABLE>> URL="https://www.amazon.com/dp/1469901730/"]
         learntoprogramwithminecraft [label=<<TABLE BORDER="0" CELLSPACING="0"><TR><TD WIDTH="100" HEIGHT="100" FIXEDSIZE="TRUE"><IMG SCALE="TRUE" SRC="images/learntoprogramwithminecraft.jpg"/></TD></TR><TR><TD>Learn to Program<br/>with Minecraft (2015)</TD></TR></TABLE>> URL="https://www.amazon.com/dp/1593276702/"]
         adventuresinminecraft [label=<<TABLE BORDER="0" CELLSPACING="0"><TR><TD WIDTH="100" HEIGHT="100" FIXEDSIZE="TRUE"><IMG SCALE="TRUE" SRC="images/adventuresinminecraft.jpg"/></TD></TR><TR><TD>Adventures in<br/>Minecraft (2014)</TD></TR></TABLE>> URL="https://www.amazon.com/dp/111894691X/"]