How to identify page authority and authority link to it?

[NadiaFL]

Please help me to identify if joining ASTA - American Society of
Travel Agents will be beneficial to me.

One of the benefits ASTA offers link from their site with logo.

http://www.asta.org/

How I can identify if this link is authorative?

Thank you!

[THB]

Regardless of the authority, there is no reason that you should not join.  It is relevant to your business, and therefore is always a good idea.

I know the pagerank toolbar is not a true indicator of authority, for the most part, however, the site you have listed is a PR7.

Go for it.

[NadiaFL]

Thank you! This means that this will be beneficial for me!

[shiftins]

In the future if you want to know lots of useful page information download the SEOmoz tool bar.

http://www.seomoz.org/seo-toolbar

it shows things like page rank, domain authority, and much more

[THB]

I was hesitant to even mention Pagerank; it is beneficial to you if the website is relevant to your niche.  Are you (your website) in the 'business of selling travel'?  If so, then it doesn't matter what the DA and PR are of that site, it's a smart business move.