There are several ways to link to sources outside HubPages in order to increase traffic.
You might consider creating a blog, this can be linked to your HubPage profile by an RSS feed, so when you produce a new hub you show this on your blog.
You can also use the share feature on any hub to send to friends via, Twitter, Facebook or a blog, Digg etc.
As you produce hubs you can cross link your own work or include other peoples hubs in your hub links panels. Don't go to too many hubs from any single hub though this damages your SEO standings. Two or three links at most.
As with many things on the internet, time will produce the greatest increase. Hubs that mature after a few months add to your SEO status and as you build links across social media, blogs and community pages such as this you will increase your visibility to search engines, driving traffic to your hubs, and hopefully more revenue.
Hope this helps.