updated registers and stack

book.tex

@@ -3857,6 +3857,11 @@ must therefore perform automatic garbage collection.
 \label{fig:copying-collector}
 \end{figure}
 
+\cite{Wilson:1992fk}
+
+Figure~\ref{fig:copying-collector}
+
+
 
 \section{Integrating Garbage Collection}
 \label{sec:integratng-GC}