hello
Are you just doing the web design work or SEO work as well?
Acccording to Google's Webmaster guidelines, you should never have to link to an SEO.
If you are doing SEO work, and your clients ever run across this, they may doubt this thing.
If you are just doing web dev, the links will help your link pop. However, links in the footer are not prime real estate and should only provide marginal benefit to you as far as ranking your keyword.
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