ref equation does not appear in parentheses latex

[ritchie31]

Hello forum, I have a question about referencing equations, because it does not appear in parenthesis. 

For example

\begin{equation}

 f(a) = \frac{1}{\sqrt{2 \pi} \sigma a}\exp\{-\frac{\ln^{2}(a/a_0)}{2\sigma^{2}}\}

\label{eq:eq_lognormal}

\end{equation}

This is \ref{eq:eq_lognormal}.

***************

It appears as 

this is equation 1.

I would like something like

this is equation (1).

Thanks

[Bruno Lopes]

Hi, Ritchie!

Try using \eqref{fig:label} from amsmath.

Bests,

Bruno.

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Bruno Lopes
www.tecmf.inf.puc-rio.br/BrunoLopes

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[ritchie31]

Thankyouuu!!!