added the listing tag and refrenced it in the paragraph above it

Author: nshizirungudieumerci@gmail.com

source/ch7_recursion.ptx

@@ -298,10 +298,11 @@ public class ArrayProcessor {
         </p>
 
         <p>
-            The following Python code demonstrates a situation where a function calls itself indefinitely without a base case, leading to a <c>RecursionError</c> due to overflowing the call stack.
+            The following Python code in <xref ref="python-recursion-error" text="type-global"/>demonstrates a situation where a function calls itself indefinitely without a base case, leading to a <c>RecursionError</c> due to overflowing the call stack.
         </p>
-        <program xml:id="python-recursion-error" interactive="activecode" language="python">
-            <code>
+        <listing xml:id="python-recursion-error">
+            <program interactive="activecode" language="python">
+                <code>
                 def cause_recursion_error():
                     """
                     This function calls itself without a base case, guaranteeing an error.
@@ -317,6 +318,7 @@ public class ArrayProcessor {
                 cause_recursion_error()
             </code>
         </program>
+        </listing>
 
         <p>
             The following Java code demonstrates a similar situation, where a method calls itself indefinitely without a base case, leading to a <c>StackOverflowError</c>.