\usepackage[caption=false,font=footnotesize]{subfig}
\begin{figure}
   \centering
   \subfloat[Caption a.]{\includegraphics[width=0.48\linewidth]{}
   \label{fig:subfig-a}}
   \quad
   \subfloat[Caption b.]{\includegraphics[width=0.48\linewidth]{}
   \label{fig:subfig-b}}
  \caption{Caption here.}
  \label{fig:subfigs}
\end{figure}