Quoting the page of one my reference document in the title of a figure

Question

I have inserted a figure in my LaTeX document, and this figure comes from a document referenced in my bibliography. The problem is that this latter document has many pages, so I would like to quote in the title of my figure in which page of the document we can find it. I am using \bibliographystyle {acm}. Would that be possible to do?

This is what I have written in LaTex:

\begin{figure}[htb] 
\capstart  
\centering
\includegraphics[width=1\textwidth]{Pictures/blablabla.pdf}
\caption{On, based on \cite{as}}
\label{fig:On}
\end{figure}

And this is what appears in my PDF Document below my figure:

"Figure 2.1: On, based on [4]"

I would like to have this (or something similar):

"Figure 2.1: On, based on [4 p.38]"

Thanks in advance!