Can someone tell me what exactly is 3 way link exchange ? Some say its A --> B --> C --> A.

Is this the way ? Or are we supposed to leave the circle unfinished?

The more i search for it on the net, the more confusing it becomes. Quite a number of articles say A --> B --> C --> A. Others say A --> B and C --> A.

But some say otherwise as well.

Does anyone know of an online authority on links?