\lipsum[1-2]
\section{First section}
\lipsum[3-4]
\label{label}
\subsection{First subsection of first section}
\lipsum[5-7]
\subsection{Second subsection of first section}
\lipsum[8-9]
\section{Second section}
See page~\pageref{label}.
\lipsum[11]
\subsection{First subsection of second section}
\lipsum[12]