This is what I've found that works.
RewriteCond %{HTTP_REFERER} !^http://www.yourdomain.com/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://yourdomain.com*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://yourdomain.com/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://www.yourdomain.com*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://yourdomain.com:80/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://www.yourdomain.com:80/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://yourdomain.com:80.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://www.yourdomain.com:80.*$ [NC]
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