Removed parts from Zhu citations.

src/topology/main/stonean.tex

@@ -40,7 +40,7 @@
     so $g \le F$. As this holds for all upper bounds of $\cf$, $g$ is the supremum of $\cf$ in $C(X; \real)$. 
     
 
-    ($\Leftarrow$, \cite[Theorem II.9.6]{Zhu}): Suppose that $X$ is completely regular and $C(X; \real)$ is order complete. Let $U \subset X$ be open and
+    ($\Leftarrow$, \cite[Theorem 9.6]{Zhu}): Suppose that $X$ is completely regular and $C(X; \real)$ is order complete. Let $U \subset X$ be open and
     \[
     \cf = \bracs{f \in C(X; [0, 1])| 0 \le f \le \one_U}
     \]