Graphics, Figures & Tables ⇒ longtable | Resize and center a Table

[I am Gianluca]

Hi all,
I have some problems with longtable environment. I don't understand where I should put \begin{centre} command.

Code: Select all

\begin{longtable}{...}
\caption{...}
\label{...}
...
\begin{quotation}\footnotesize
...
\end{quotation}		
\end{longtable}

Moreover I don't understand how resize the table. Normally I use something similar to this:

Code: Select all

\begin{table}
\caption{...} 
\label{...}
\begin{centre}
\scalebox{0.65}{
\begin{tabular}{...}
...
\end{tabular}}
\end{centre}
\begin{quotation}\footnotesize
...
\end{quotation}   
\end{table}

... but with longtable environment I'm not able to resize the table
I've already tried to find the solution on longtable package's documentation but I didn't find anything helpful.
Thank you for your time.

Gianluca