I don't think there is another way of linking your articles together without making new hubs, then you link your hubs into a group and they are linked at the bottom of your article. also you can link your hubs together in the text with hypertext.
you could look at my paris hubs or early childhood hubs and see how they're linked both in text and at the bottom. hope this helps. if not, keep asking.
here's a helpful link. bookmark all of his how-to hubs and you'll be on your way.