Added section on cross-referencing

lbol.tex

@@ -929,6 +929,28 @@ The following array shows the difference between ordinary and ``nice'' fractions
 
 \section{Internal References}
 
+To refer to something somewhere else in your document, you first have to label it using the \verb+\label{}+ command:\label{example1}
+
+\begin{Verbatim}
+This is a line of text. \label{example1}
+\end{Verbatim}
+
+To refer to it, you can use \verb+\ref{example1}+. This will insert either the section number, the page number, the equation number, or the figure number, depending on what you attached the label to.
+
+If you \textbf{must} refer to a page number, use \verb+\pageref{example1}+. 
+
+\begin{Verbatim}[frame=lines,framesep=3mm, breaklines=true, label=\fbox{Cross-Referencing Example}]
+Internal references (i.e., cross-references) are explained in section \ref{example1} on page \pageref{example1}.
+\end{Verbatim}
+
+\noindent{}produces this output:
+
+\klab{8pt}{Cross-Referencing Example}{8pt}
+
+\noindent{}Internal references (i.e., cross-references) are explained in section \ref{example1} on page \pageref{example1}.
+
+\krule{8pt}{8pt}
+
 \section{Bibliographies}
 
 \LaTeX{} has two major ways of handling bibliographies: an embedded system using the \texttt{bibitem} command, and an external system using \texttt{BibTeX}. Both systems have their advantages and disadvantages.