Best Practices for Any Type of Referrals

1. Experiment.

Try various text links and button designs to see which performs best on your site. Our policies allow you to place three referral units may be displayed on any given page.

2. Customize your text links.

Our policies allow publishers to alter the font and size of the text link using standard HTML "font" tags around the link. However, the font size changes must be reasonably necessary to match the theme of the site. Unreasonable or abusive changes will constitute a violation of our program policies.

3. Choose relevant products to refer.

For example, if you have a site about blogging or web hosting, an AdSense referral unit may work best on your site. The referral product that is most relevant to the content of your site will most likely perform best.

4. Rotate referral units when you rotate content.

Always check to see that the relevance of your referral unit is not diminished by your change in content.

You can also review our referrals case study for more helpful tips and suggestions.

( sources : http://www.google.com/adsense )